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Savais-tu que...Le poids des bactéries

S2 E130
·
2017

Christopher compares the weight of all bacteria in the human body to the weight of three basketballs.

Levels:
Elementary Grade 2 Grade 3 Grade 4 Grade 5 Grade 1
Subjects:
Health and Physical Education Health Science and technology Life Systems
Skills:
Self-Directed Learning
French level:
B1: Threshold Independent User (B1 - B2) A2: Waystage Basic User (A1 - A2)
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E1 : Savais-tu que... Chandelles

30s
Christopher explains that the tradition of candles on birthday cakes comes from the Greeks who wanted to thank the Goddess of deliveries.
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E2 : Savais-tu que... Protocératops

30s
Christopher explains that dinosaur bones were discovered by the Greeks of ancient Greece.
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E3 : Savais-tu que... Monosourcils

30s
Christopher explains that the single eyebrows were a sign of beauty and intelligence in ancient Greece.
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E4 : Savais-tu que... Théâtre

30s
Christopher explains that it was the Greeks who invented the theater. At the time, the actors wore masks to express the emotion of their character.
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E5 : Savais-tu que... Pommes

30s
Christopher explains that in ancient Greece, someone was throwing an apple to reveal our love.
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E6 : Savais-tu que... Chiton

30s
Christopher explains that the chiton was a long, short-sleeved tunic worn by both men and women in ancient Greece.
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E7 : Savais-tu que... Métro et ruines

30s
Christopher explains that the ruins of an old Greek market were destroyed during the construction of a metro.
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E8 : Savais-tu que... Machines distributrices

30s
Christopher explains that the vending machines already existed in the Greeks era when one was built to distribute holy water at the entrance of the temples.
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E9 : Savais-tu que...Le yo-yo

30s
Josée explains that yoyo is one of the oldest games in the world; the Greeks of ancient Greece played it.
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E11 : Savais-tu que... Olympique nus

30s
Christopher explains that wrestling was one of the main sports present at the Olympic Games in ancient Greece and that at that time, wrestlers had to be naked to practice their sport.
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E12 : Savais-tu que... Trêve olympique

30s
Christopher explains that at the time of ancient Greece, there was a truce of all wars going on between the various Greek peoples one month before the start of the Olympic Games so that everyone could fully enjoy the event.
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E13 : Savais-tu que... Colliers pointus

30s
Christopher explains that sharp dog collars were invented by the Greeks to protect the neck of their flock dogs from the wolves.
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E14 : Savais-tu que... Païens

30s
Christopher explains that the Vikings were pagans, that is to say they believed in several gods at the same time.
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E16 : Savais-tu que... Amérique

30s
Two Canadians discovered that Vikings visited Canada before Christophe Colomb came.
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E17 : Savais-tu que... Poisson fumé

30s
Smoked salmon is a food that has been consumed for a long time. The Vikings regularly smoked salmon at the time so that they could keep it longer on the move.
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E22 : Savais-tu que... Momies riches

30s
Christopher explains that only the richest Egyptians get mummified.
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E23 : Savais-tu que... Momification

30s
Christopher explains the process followed to mummify a person at the time of ancient Egypt.
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E25 : Savais-tu que... Cléopâtre

30s
Christopher tests our knowledge about the famous queen of Egypt. Did you know that she was not born in this country?
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E26 : Savais-tu que... Femmes « roi »

30s
In this video, Lexie shares with us a historical fact about the title of women in ancient Egypt.
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E29 : Savais-tu que... Dentifrice

30s
Lexie explains that Egyptians in ancient Egypt used toothpaste to brush their teeth.
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E30 : Savais-tu que... Dieux

30s
Lexie explains that the Egyptians of ancient Egypt worshiped more than 700 gods.
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E31 : Savais-tu que... Pain

30s
Lexie explains that Egyptians have discovered how to inflate the bread during cooking.
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E33 : Savais-tu que... Cloacina

30s
Lexie says that the Romans had a sewer goddess, Cloacina.
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E34 : Savais-tu que... Barrages

30s
Lexie explains that the Romans had developed very effective construction methods: some of their dams built 1900 years ago are still in place today.
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E35 : Savais-tu que... Nourriture préférée des Romains

30s
Lexie explains that Romans, especially the wealthy, liked to eat exotic foods such as the flamingo.
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E37 : Savais-tu que... Long Conflit

30s
Lexie says that a war has already lasted more than 700 years; between the Romans and the Perces.
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E38 : Savais-tu que... Urine

30s
Lexie explains that Romans used their urine for a variety of purposes: fertilizing the soil, softening leather, brushing teeth, and so on.
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E39 : Savais-tu que... Heures

30s
Lexie explains that the system for calculating the time of the Romans was different from the one we know today: it varied according to the time of the year.
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E40 : Savais-tu que... Aqueducs

30s
Lexie explains that the Romans had created an excellent system of aqueducts that allowed them to obtain water.
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E41 : Savais-tu que... Invention de la vitre

30s
Lexie explains that glass was invented more than 5000 years ago in Mesopotamia. In the beginning, the glass was not transparent, it was green or blue.
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E43 : Savais-tu que... Son propre dieu

30s
Lexie explains that in Mesopotamia there was a large amount of gods and it was even possible to have one's own companion.
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E44 : Savais-tu que... Épopée de Gilgamesh

30s
Lexie shares that Mesopotamia had a famous personality, King Gilgamesh, whose legend was known to all.
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E45 : Savais-tu que... Écriture cunéiforme

30s
Lexie explains that the Sumerians of ancient Iraq created one of the earliest form of writing, cuneiform writing, that would appear before hieroglyphics.
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E46 : Savais-tu que... Système de calcul

30s
Lexie explains that the Sumerians of ancient Iraq invented a system of numbers based on 60, used to calculate time.
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E47 : Savais-tu que... Akkadiens

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E49 : Savais-tu que... Jardins suspendus de Babylone

30s
Lexie explains that a king of Mesopotamia had a hanging garden built for his wife who missed the mountains of her hometown.
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E50 : Savais-tu que... OEil pour oeil, dent pour dent

30s
Christopher explains that the first system of laws was invented in Mesopotamia and that the famous expression 'an eye for an eye, a tooth for a tooth' figured among these laws.
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E51 : Savais-tu que... Poterie

30s
Christopher explains that the Japanese are one of the first peoples to have discovered the art of pottery.
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E52 : Savais-tu que... Dogû

30s
Christopher explains that the Dogûs, small clay sculptures, are one of the first forms of art that date back to pre-history.
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E53 : Savais-tu que... Plus vieille histoire de voyage dans le temps

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E54 : Savais-tu que... Guerrières samurai

30s
Christopher explains that the Samurai army was made up of women as well as men.
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E55 : Savais-tu que... Kofun

30s
Christopher explains that the Japanese had underground tombs in the form of locks that they called Kofun.
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E56 : Savais-tu que... Japon et la Corée

30s
Christopher explains that the Korean people passed on a lot of their knowledge to the Japanese in the days of ancient Japan, which allowed the Japanese to make important discoveries in the future.
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E57 : Savais-tu que... Samurai éduqués

30s
Christopher explains that the Samurais learned to do much more than fight: they learned reading, calligraphy, horse riding, painting, and so on.
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E58 : Savais-tu que... Katana

30s
Christopher explains that in the days of ancient Japan, an art was devoted to sword testing.
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E59 : Savais-tu que... Longs arcs

30s
Christopher explains that the samurai used bow that were 2 meters long, as this prevented them from breaking.
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E60 : Savais-tu que... Origine du sushi

30s
Christopher explains that modern sushi comes from an old habit of China and Japan.
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E61 : Savais-tu que... Les roux!

30s
Christopher explains that a large number of Celts were red hair.
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E62 : Savais-tu que... Les bardes

30s
Christopher explains that Celtic musicians, called bards, were highly respected in their day.
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E63 : Savais-tu que... Chiens

30s
Christopher explains that the Celts ate a lot of animals, even dogs!
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E64 : Savais-tu que... Les mines de sel

30s
Christopher explains that the Celts made their fortune through the salt mines.
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E65 : Savais-tu que... Les grands banquets

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E66 : Savais-tu que... Les druides

30s
Christopher explains that the roads were invented by the Celts to allow their Druids to meet while walking from one village to another.
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E67 : Savais-tu que... La tradition orale

30s
Christopher explains that there is little known about Celtic traditions, because the Druids of that time kept secret all knowledge of their people.
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E68 : Savais-tu que... Les menhirs

30s
Christopher explains that it was the ancestors of the Celts who created the menhirs.
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E69 : Savais-tu que... Les murus gallicus

30s
Christopher explains the methods and building materials used by the Romans.
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E70 : Savais-tu que... L´invention du savon

30s
Christopher explains that it was the Celts who discovered soap.
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E71 : Savais-tu que... Les épées

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E72 : Savais-tu que... Guerrières

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E73 : Savais-tu que... Les romains, ces copieurs

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E75 : Savais-tu que... Une grande imagination

30s
Christopher explains that the Celts are at the origin of fairytale characters such as fairies, elves and goblins.
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E76 : Savais-tu que... Armure de papier

30s
Lexie explains that the soldiers of the Chinese army of the 600's wore armor made of paper.
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E77 : Savais-tu que... Vieille soupe

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E78 : Savais-tu que...Riz collant dans le mur

30s
Lexie explains that the Chinese have used rice to build the Great Wall of China.
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E79 : Savais-tu que... Crème glacée

30s
Lexie explains that the ice cream was discovered about 200 years before our era by a Chinese emperor.
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E80 : Savais-tu que... Les grillons

30s
Lexie explains that crickets were very popular in ancient China: they were kept as pets and fought.
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E81 : Savais-tu que...Mulan

30s
Lexie tells the story of the Chinese girl, Mulan, who was the first woman to fight in a Chinese army.
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E82 : Savais-tu que.. La Grande Muraille

30s
This capsule explains the construction of the Chinese wall and its characteristics.
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E83 : Savais-tu que... Le fer

30s
Lexie explains that the Chinese were geniuses of metalurgy, the mixture of minerals to form new ones.
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E84 : Savais-tu que... Découverte de la soie

30s
Lexie tells the discovery of silk in China more than 5000 years ago.
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E85 : Savais-tu que... Invention du papier

30s
Lexie tells the story of the invention of paper.
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E86 : Savais-tu que... Serpillère de cheveux

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E87 : Savais-tu que...L'humain qui pète

30s
Lexie explains why men fart more than women, but women's farts stink more.
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E88 : Savais-tu que...Papillons dans l'estomac

30s
Lexie explains that the adrenaline released in the body when it is stressed explains the butterflies that we feel in our belly.
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E89 : Savais-tu que...Le hoquet

30s
Lexie explains that there are several types of hiccups, including one that lasts for months or even years.
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E90 : Savais-tu que...Notre corps d'or

30s
Lexie explains that the human body contains gold: it absorbs this mineral from the foods eaten.
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E91 : Savais-tu que...Les cheveux en santé

30s
Lexie explains that human hair is one of the strongest fibers on the planet. A healthy hair is as strong as a copper wire of the same diameter
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E92 : Savais-tu que...Les papilles gustatives

30s
Lexie explains that the taste buds that detect the flavor of food are not all found on the tongue; they are hidden everywhere in the mouth.
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E93 : Savais-tu que...Boire et respirer en même temps

30s
Lexie explains that newborns are able to drink and breathe at the same time as their larynx and higher in the throat that an adult.
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E94 : Savais-tu que...Une langue sèche

30s
Lexie explains that when the tongue is dry, it does not taste anything.
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E95 : Savais-tu que...La barbe pousse vite

30s
Lexie explains that beard hair grows faster than any other hair of the human body.
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E96 : Savais-tu que...L'empreinte de la langue

30s
Lexie explains that, as with fingerprints, every human being has a different tongue print that makes it possible to identify him.
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E97 : Savais-tu que...Les ongles de doigts vs ongles de pieds

30s
Lexie explains that the nails of the hands grow faster than the nails of the feet.
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E98 : Savais-tu que...La surface des poumons

30s
Lexie explains that the surface of the lungs and their alveoli is as big as a tennis court.
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E99 : Savais-tu que...Dépenser de l'énergie pendant le sommeil

30s
Food gives energy to the body and allows it to work well, even when sleeping!
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E100 : Savais-tu que...Éternuer les yeux ouverts

30s
Lexie explains that it takes a lot of concentration to sneeze with open eyes.
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E101 : Savais-tu que...Nombre de dents

30s
Lexie explains that children have fewer teeth than adults.
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E102 : Savais-tu que...L'énergie du coeur

30s
Lexie explains that the heart produces electricity, which makes it beat and pump the blood into the body.
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E103 : Savais-tu que...La plaque

30s
Lexie explains how plaque and cavities are formed on teeth.
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E104 : Savais-tu que...La formation de dents double à refaire

30s
Lexie explains the formation of teeth in a child, from its development in the belly of his mother.
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E105 : Savais-tu que...La cire protectrice

30s
Lexie explains that ear wax plays an important role in protection, so it is important not to wash your ears too often.
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E106 : Savais-tu que... Poudre à canon

30s
Gunpowder was invented in ancient China. It was used primarily to make flying fire that scared enemies.
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E107 : Savais-tu que... Parapluie

30s
Umbrellas were invented in China more than 3000 years ago. At first, they were made of paper and served as a parasol. They were subsequently soaked in oil to protect the paper from water and became umbrellas.
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E108 : Savais-tu que ... L'armée de terre cuite

30s
There is an army of 8000 terracotta soldiers who were made by ancient Chinese craftsmen to protect the tomb of an emperor.
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E109 : Savais-tu que .. Pieds bandés

30s
In ancient China, it was fashionable to have small feet, so girls' feet were bandaged to prevent them from growing up. Small feet were a sign of wealth, but also a source of many physical problems.
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E110 : Savais-tu que... Cerf-volants

30s
Kites were invented in ancient China more than 2000 years ago. Initially, they were not used for fun, they were used by the army rather to warn the arrival of an enemy or to scare him.
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E111 : Savais-tu que ... Couper ses cheveux

30s
In ancient China, the hair was sacred. People let their hair grow all their life without ever cutting them. The prisoners' hair was cut in disgrace.
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E112 : Savais-tu que ... Couleurs des vêtements

30s
Lexie explains that there was a color code for clothing in ancient China. The peasants had to wear blue or black clothes and the rich could wear red or purple.
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E113 : Savais-tu que... Baguettes

30s
The Chinese invented the first modern utensils: chopsticks. These were used first to mix the food and are now used to eat the meal.
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E114 : Savais-tu que... Le Grand Canal

30s
The longest canal in the world is in China. Its length is 1700km. In the past, it was used to carry food to soldiers protecting the border.
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E115 : Savais-tu que... Légendaire dragon

30s
Lexie explains that the dragon is the character of one of the most famous legend of ancient China. This emblem with a snake's body that can fly and control the weather would have been even incarnated by an emperor at his death.
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E116 : Savais-tu que...Le nez a une excellente mémoire

30s
Short capsule where Lexie explains that the nose can smell up to 100,000 different smells that are recorded in the olfactory memory.
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E117 : Savais-tu que...Une piqûre fatale

30s
It would take 1.2 million mosquitoes to sting at the same time for our body to lose all its blood. That's what Lexie explains in this capsule.
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E118 : Savais-tu que...L'estomac rougit

30s
It's not only the cheeks that blush when we're embarrassed, the stomach too! Lexie explains this phenomenon in this short capsule.
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E119 : Savais-tu que...La pousse du cheveu

30s
Lexie explains how a hair grows and the possible differences in each person.
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E120 : Savais-tu que...La transpiration n'a pas d'odeur

30s
Lexie explains the phenomenon of the scent that occurs when we sweat. It's not the sweat that we smell, but the bacteria that are on our skin.
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E121 : Savais-tu que...Le petit doigt est indispensable

30s
Lexie explains that the hand would be 50% less strong without the little finger. The latter is essential!
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E122 : Savais-tu que...L'humain, le meilleur coureur du règne animal

30s
Although he is not the fastest in the race, the human body remains the best runner because of his stamina.
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E123 : Savais-tu que...Un coeur qui bat en rythme

30s
Lexie explains that heartbeats adjust to the rhythm of the music the person listen to.
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E124 : Savais-tu que...La couleur des os

30s
The skeletons displayed in museums are composed of white bones, yet the true color of the bones of the human body varies from brown to beige. It takes quite the bleaching job so that the bones get as clean!
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E125 : Savais-tu que...Assez de fer pour faire un clou!

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E126 : Savais-tu que...Un odorat paresseux!

30s
Smell is the sense that takes the most time to wake up.
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E127 : Savais-tu que... Une vue renversante!

30s
Christopher explains that the images captured by the eye are reversed before going to the brain, which gives them their original position.
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E128 : Savais-tu que...La paume des mains ne peut pas bronzer

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E129 : Savais-tu que...Le liquide le plus glissant du monde

30s
The human body makes the most slippery liquid in the world, the synovial fluid, which is between the bones in the joints.
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E130 : Savais-tu que...Le poids des bactéries

30s
Christopher compares the weight of all bacteria in the human body to the weight of three basketballs.
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E131 : Savais-tu que...La peau plus lourde que le cerveau

30s
Christopher explains that the skin is the heaviest organ in the human body.
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E132 : Savais-tu que...L'épaisseur de la peau

30s
Christopher explains that the thinnest skin is found on the eyes and the thickest is on the hands and feet.
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E133 : Savais-tu que...Les yeux, principale source d'informations

30s
Eyes are an important source of information for the brain and require a lot of effort on the part of the body to function well.
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E134 : Savais-tu que...La production de salive dans toute une vie!

30s
In this short capsule, Christopher explains that during our life, the body produces enough saliva to fill two pools.
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E135 : Savais-tu que...Un éternuement... puissant!

30s
Christopher explains that the air that is projected during a sneeze can reach a speed of 56km / h and can land 9m further. It is therefore important to cover your mouth with your elbow when sneezing!
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E136 : Savais-tu que...Couleur de cheveux versus quantité

30s
People with blond hair have more hair than others, but they are thinner, while people with red hair are the ones with the least hair.
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E137 : Savais-tu que...La langue cicatrise le plus vite

30s
Christopher explains that the tongue is a part of the body that heals very quickly because of the multiple blood vessels that make it up.
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E138 : Savais-tu que...La pousse de l'ongle

30s
Christopher explains that the nails of the hands grow faster than the nails of the feet, because the growth of the nails is associated with the shocks: as the hands are used more than the feet, the nails grow faster.
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E139 : Savais-tu que...Renouvellement de la peau

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E141 : Savais-tu que...Les muscles les plus actifs (les yeux)

30s
Christopher explains that the muscles of the eyes are the most active muscles of the human body.
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E142 : Savais-tu que...Souffle blanc quand il fait froid

30s
Christopher explains that our breath becomes white when it is cold, because it turns into small droplets of water in contact with the cold.
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E143 : Savais-tu que...Un corps... brillant!

30s
Christopher explains that the human body emits light that is not visible to the naked eye.
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E144 : Savais-tu que...A.D.N. des bananes et du corps humain

30s
Christopher explains that humans and bananas have 50% of their DNA that is similar.
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E145 : Savais-tu que...La puissance du cerveau

30s
Christopher explains that the energy produced by the brain would be powerful enough to light a light bulb.
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E146 : Savais-tu que... On est plus grand le matin que le soir

30s
We measure up to 2 centimeters taller when we wake up. Christopher introduces us to this phenomenon.
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E147 : Savais-tu que...Sourire versus bouder

30s
Christopher explains that it is more difficult for our body to sulk than to smile, because the muscles to sulk are less often used than those to smile.
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E148 : Savais-tu que...Le cerveau a besoin d'eau

30s
Christopher explains that the brain needs water to work well, so it's important to drink plenty of water throughout the day.
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E149 : Savais-tu que...La langue change de couleur

30s
Christopher explains that the color of the tongue can express a person's state of health.
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E150 : Savais-tu que...Les hémisphères du cerveau

30s
Christopher explains the role of each hemisphere of the brain.
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E151 : Savais-tu que...Les jumeaux identiques

30s
Christopher explains that identical twins are called monozygotes because they are two sperm that fertilized the same egg that subsequently split.
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E152 : Savais-tu que...Nos intestins défient la gravité

30s
Christopher explains that even if you eat your head down and your feet up, the muscles of the esophagus and intestines will still be able to digest the food.
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E153 : Savais-tu que...La sueur, régulateur de température

30s
Christopher explains that the pores of the skin enlarge when the human body is warm in order to let the perspiration out and thus lower the body temperature.
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E154 : Savais-tu que...La mélanine : déterminant de la couleur de peau

30s
Christopher explains that the amount of melanin production in our body determines the color of the skin.
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E155 : Savais-tu que...La digestion commence dans la bouche

30s
Christopher explains the process of digestion and how it begins in the mouth with teeth that cut food into small pieces.
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E156 : Savais-tu que...La poussière est faite de peau morte

30s
Christopher explains that dust is made up of many things including dead skin cells.
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E157 : Savais-tu que...Le gros intestin n'est pas grand

30s
Lexie explains that, despite its name, the large intestine is shorter than the small intestine and is about 1.5m long.
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E158 : Savais-tu que...La peau : l'organe le plus grand

30s
Lexie explains that the skin is the largest and heaviest organ of the human body.
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E159 : Savais-tu que...Le rôle des reins

30s
Lexie explains that the kidneys are very important organs in the body because they eliminate the waste that travels in the blood.
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E160 : Savais-tu que...On peut vivre avec un seul rein

30s
Lexie explains that the human body works very well with just one healthy kidney.
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E161 : Savais-tu que...La langue a un superpouvoir

30s
Lexie explains that one third of the tongue is not visible and helps to get food down the throat.
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E162 : Savais-tu que...Des millions de bactéries sur notre peau

30s
Lexie explains that the skin is covered with millions of bacteria that help protect against diseases.
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E163 : Savais-tu que...Les os grandissent et s'arrêtent

30s
Lexie explains that bones grow and become stronger until the age of 16 for girls and 20 for boys.
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E164 : Savais-tu que...Le rôle du squelette

30s
Lexie explains that the skeleton serves as a base for the muscles and allows the body to be strong and protects organs such as the heart.
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E165 : Savais-tu que...Le plus petit os

30s
Lexie explains that the smallest bone of the human body is in the ear and is called the stirrup.
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E166 : Savais-tu que...Des kilomètres de vaisseaux sanguins

30s
Lexie explains that there are three types of blood vessels in the body that carry blood and that measure in all more than 160,000km in length.
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E167 : Savais-tu que...Un os cassé se répare

30s
Lexie explains that bones repair themselves when they break; however, they need to be immobilized to get there.
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E168 : Savais-tu que...Le plus petit organe

30s
Lexie explains that the smallest organ of the human body is in the brain and is called the epiphysis.
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E169 : Savais-tu que...Les bactéries donnent mauvaise haleine

30s
Lexie explains that there are more than 600 different types of bacteria on the tongue that cause bad breath.
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E170 : Savais-tu que...Les trois parties de l'oreille

30s
Lexie explains the name and role of the three inner parts of the ear.
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E171 : Savais-tu que...Le coeur travaille fort

30s
Lexie explains that the heart is the muscle that works the most in the human body.
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E172 : Savais-tu que...Nombre de pensées par jour

30s
Lexie explains that there are more than 60,000 thoughts running through the mind during a day.
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E173 : Savais-tu que...Moins d'os en grandissant

30s
Lexie explains that some bones merge when they grow up, so that an adult's body has less bone than a child's body.
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E174 : Savais-tu que...Doigts fripés dans l'eau

30s
Lexie explains that cells that make the hands impermeable absorb water when the fingers are submerged for a long time in the water, which makes the fingers appear clutched.
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E175 : Savais-tu que...Le système nerveux

30s
Lexie explains that the human body is composed of 150 000km of nerves that can perceive sensations.
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E176 : Savais-tu que... La plus vieille civilisation

30s
Lexie explains that a people of ancient India, the Arameans, would have lived before the ancient Greeks and the Egyptians.
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E177 : Savais-tu que... Des ingénieurs

30s
Lexie explains that people in ancient India were very ingenious: they already knew how to build two-story houses, soundproof walls and more.
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E178 : Savais-tu que... Premières toilettes

30s
Lexie explains that the people of ancient India created the first toilets.
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E179 : Savais-tu que... Des mesures précises

30s
Lexie explains that the people of ancient India would be one of the first peoples to use a rule to measure.
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E180 : Savais-tu que... Les premiers dentistes

30s
Lexie explains that people in ancient India also had dentists and had created a drill able to remove cavities.
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E181 : Savais-tu que... Pacifiques et sans armée

30s
Christopher explains that the peoples of ancient India were very peaceful: there are few signs of war or weapons in their works and architecture.
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E182 : Savais-tu que... Langue indéchiffrée

30s
Christopher explains that much information related to the civilization of ancient India is still unknown because no one has been able to decipher their language in the traces found.
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E183 : Savais-tu que... Beaucoup de jouets

30s
Christopher explains that the people of ancient India are one of the first peoples to have made toys for their children.
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E184 : Savais-tu que.... De solides briques

30s
Christopher explains that the bricks made by the people of ancient India were so solid that they were used by the British in the 1800s to build a railway.
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E186 : Savais-tu que... La fille dansante

30s
Christopher explains that the Harappan peoples made an impressive bronze statue, which demonstrates that they knew how to forge iron.
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E187 : Savais-tu que... Invention du yoga

30s
Christopher explains that yoga already existed at the time of the Harappeans, people of ancient India 5000 years ago.
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E188 : Savais-tu que... Le premier chirurgien plastique

30s
Christopher explains that the first plastic surgeon lived in ancient India 2600 years ago.
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E189 : Savais-tu que... Invention du chiffre ZÉRO

30s
Christopher explains that it is the people of ancient India who invented the zero, the representation of 'nothing'.
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E190 : Savais-tu que... Des licornes en Inde

30s
Christopher explains that the ancient civilization of India drew and sculpted unicorns.
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E191 : Savais-tu que... Le coton

30s
Christopher explains that it was the Mongols who brought cotton to China when they invaded it in the 13th century.
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E192 : Savais-tu que... Jeune cavalier

30s
Christopher explains that horses play a very important role in society for Mongolians: children learn to ride at the age of four.
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E193 : Savais-tu que... Pros de la survie

30s
Christopher explains that the Mongols were excellent at finding food on their expeditions to expand their empire.
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E194 : Savais-tu que... Le code de tolérance

30s
Christopher explains that the Mongols were very respectful when they invaded new territory: they adopted the religion and way of life of the invaded people.
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E196 : Savais-tu que... Les tentes yourtes

30s
Christopher explains that the Mongols were a nomadic people at the time: they had invented the yurt, which is a tent that settles quickly.
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E197 : Savais-tu que... Femmes puissantes

30s
Christopher explains that in the 18th century, Mongolian women occupied all roles in society while men had often conquered new territories.
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E198 : Savais-tu que... La poste en Mongolie

30s
Chrsitopher explains that the Mongolians of the day had an excellent post system that allowed Factors to change horses in relay positions rather than having to wait for their horse to rest to continue their journey.
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E199 : Savais-tu que... Effrayants tartares

30s
Christopher explains that the ancient peoples were very afraid of the Mongols who were known for their power and their attacks: they called them the Tartars.
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E200 : Savais-tu que... Entrailles et Haruspices

30s
Christopher explains that the Haruspices, members of the population of the Etruscans in ancient Italy, had the job of killing animals and watching their liver to know the future.
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E202 : Savais-tu que... Cornu

30s
Christopher explains that the Etruscans, people of ancient Italy, knew how to work hot iron and had built a musical instrument that they had named horned.
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E203 : Savais-tu que... Les pinguis

30s
Christopher explains that the Etruscans, people of ancient Italy, loved to eat, drink and party and were known to be quite plump.
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E204 : Savais-tu que... Fans des Grecs

30s
Christopher explains that the Etruscans, people of ancient Italy, were inspired much of the Greeks for the architecture of their buildings.
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E205 : Savais-tu que... Vêtements unisexes

30s
Christopher explains that the men and women of ancient Italy wore the same clothes.
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E206 : Savais-tu que...Les reins équilibrent le volume de liquide

30s
Lexie explains that the inflow and outflow of liquids in the human body are balanced by the kidneys.
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E207 : Savais-tu que...L'eau : le breuvage préféré des reins

30s
Lexie explains that water helps the kidneys eliminate waste in the blood.
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E208 : Savais-tu que...Écouter la musique forte

30s
Lexie explains that prolonged listening to loud music could be detrimental to hearing.
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E209 : Savais-tu que...Les allergies : la réaction du corps

30s
Lexie explains what are allergies and various reactions of the human body.
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E210 : Savais-tu que...Le foie peut se régénérer

30s
Lexie explains that the liver is the only part of the human body that can regenerate itself.
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E211 : Savais-tu que...Les trois couches de notre peau

30s
Lexie explains and names the three layers of skin found on the human body, the epidermis, the dermis and the hypodermis.
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E212 : Savais-tu que...Vomit versus fromage parmesan

30s
Lexie explains that research conducted by a scientist has shown that vomit has the same odor as parmesan cheese.
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E213 : Savais-tu que...L'exercice nous aide à être plus intelligent

30s
Lexie explains that physical activity helps to be more alert and focused, which helps learning.
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E214 : Savais-tu que...Apprendre change le cerveau

30s
Lexie explains that neurons in the brain change the structure of the brain when new learning is done.
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E215 : Savais-tu que...Les oreilles nous gardent en équilibre

30s
Lexie explains that a liquid in the ears helps to keep the balance.
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E216 : Savais-tu que... Des sourcils pour mieux voir

30s
Eyebrows are more useful than you think. Lexie explains why they are essential for the protection of our eyes.
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E226 : Savais-tu que... De l'acide puissant dans l'estomac

30s
Lexie teaches us why our bodies need to produce acid. We eat a lot of food a day and this substance allows us to dissolve our food.
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E227 : Savais-tu que... Le chocolat et le cerveau

30s
Lexie gives us some interesting facts about the effects of eating chocolate. We all love to eat it, but if it helps us improve our memory, that's even more positive!
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E228 : Savais-tu que... Entendre sa voix

30s
Lexie shows us how to hear our own voice. Did you know that you can hear it? Just follow Lexie's advice.
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E229 : Savais-tu que... Le réflexe d'immersion

30s
The body has many surprises and reactions. Did you know that your heart slows down when you swim in cold water?
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E231 : Savais-tu que... Nombre de muscles dans notre corps

30s
Did you know that in our body we have many muscles. They are not all the same size. Lexie gives us some key facts about composition and number.
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E232 : Savais-tu que...Température du corps

30s
The body temperature is a very important subject in the health field. Sometimes we feel hot, even too hot, especially when we have a fever. This shows that our body temperature fluctuates. Lexie explains this phenomenon to us.
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E233 : Savais-tu que...La quantité d'eau dans notre corps

30s
Lexie shares facts about the human body. Every living thing contains a certain amount of water. Do you know how much water we have in our bodies?
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E235 : Savais-tu que...La perception des couleurs

30s
In this video, Lexie introduces us to the phenomenon of color perspective. Did you know that we can only see 3 colors?
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E236 : Savais-tu que... Les facteurs

30s
Christopher explains that the Incas had factors that were responsible for transmitting messages across the empire through suspended bridges.
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E237 : Savais-tu que... Chirurgies crâniennes

30s
Christopher explains that the Incas were already doing surgeries more than 3000 years ago to try to heal the wounds of war.
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E238 : Savais-tu que... Les premières patates

30s
Christopher explains that it was the Incas who cultivated the first potatoes.
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E239 : Savais-tu que... Maison casse-tête

30s
Christopher explains that the Inca houses were built with cut stones to fit perfectly against each other; it was not necessary to put cement to hold them.
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E240 : Savais-tu que... Test d'intelligence pour adolescents

30s
Christopher explains that as a teenager, young Incas had to pass an intelligence test that determined whether they would work in government or stay in their village.
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E241 : Savais-tu que... Temples empilés

30s
Christopher explains that the Incas built new pyramids over old ones when they became worn out.
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E242 : Savais-tu que... Crânes allongés

30s
Josée explains that some Incas put bandages around the head of their baby so that their skull lengthens growing up.
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E244 : Savais-tu que ... Les routes

30s
Josée explains that the Incas had built more than 40 000km of road and moved on foot or on the back of animals.
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E245 : Savais-tu que ... Pas d'écriture

30s
Josée explains that the Aztecs wrote little: the actors had to learn the message by heart to be able to transmit the mail.
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E248 : Savais-tu que ... Machu Picchu

30s
Josée explains that the Machu Picchu is one of the only Aztec city not to have been destroyed by the Spaniards: they did not find it because of its high altitude.
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E249 : Savais-tu que... Soccer

30s
Josée explains that the Aztecs played soccer in their day: they found themselves on a ground where he had to pass a ball in a stone circle.
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E250 : Savais-tu que ... Tatouages de guerrier

30s
Josée explains that the Aztecs recognized the work of their warriors by creating a tattoo in their image on a war victory.
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E251 : Savais-tu que... La variole

30s
Josée explains that the Aztec population has disappeared because of the smallpox disease that had been brought to America by the Spaniards.
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E252 : Savais-tu que ... Chiens guides vers l'au-delà

30s
Josée explains that dogs were very important to the Aztecs: according to the beliefs, they were the ones who showed them the way to the afterlife.
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E259 : Savais-tu que... Peaux de chevreuil

30s
Ancient civilizations did not write on ordinary paper. They used animal skins to write and communicate with each other.
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E274 : Savais-tu que...Se frapper le coude, ça fait mal

30s
Lexie explains that the ulnar nerve is responsible for the tingling sensation that occurs when one strikes one's elbow.
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E288 : Savais-tu que... Pourquoi baille-t-on?

30s
Yawning is part of our daily lives and is often associated with sleep. But do we really know why we yawn?
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E290 : Savais-tu que... Voyage autour de notre corps en 60 secondes

30s
Blood circulates in our bodies. In this episode, Lexie introduces us to interesting facts such as the speed of blood flow.
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E300 : Savais-tu que...Caribou : mot micmac

30s
Through funny and educational vignettes, Josée, Lexie and Christopher test the audience's knowledge on fascinating subjects such as astronomy, dinosaurs, fauna, flora, great civilizations and the human body. In this episode, Lexie presents some interesting facts about the caribou.
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E301 : Savais-tu que...Origine du jeu de la crosse

30s
Did you know that... the game of lacrosse was invented by the Iroquois? Lexie gives us some information on the origins of a sport that has been practiced for several hundred years.
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E302 : Savais-tu que...Langues autochtones

30s
Lexie introduces us to the different First Nations communities. We also learn that there are over 70 Native languages spoken in Canada.
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E303 : Savais-tu que...L'opossum

30s
Did you know that the word opossum comes from the Algonquin language? They can be found in Canada to Central America.
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E304 : Savais-tu que...Québec

30s
Lexie makes us discover the origins of Quebec. But where does the name come from?
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E305 : Savais-tu que... Ottawa : nom autochtone

30s
Lexie introduces us to the origin of the city of Ottawa's name through historical facts.
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E306 : Savais-tu que...Maïs

30s
In this video, Lexie introduces us to a familiar food that we know all over the world: corn. But where exactly does it come from?
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E308 : Savais-tu que...Canot

30s
In this episode, Lexie gives us the history of the word canoe. We also learn that this term comes from the native peoples.
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E309 : Savais-tu que...

30s
Canada is a country but where does the origin of its name come from. Lexie tells us about its history and the reasons why it is called that!
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E310 : Savais-tu que...Ontario

30s
In this video, Lexie surprises us with some unusual facts about Ontario! This beautiful province used to be called kanadario. Did you know that?
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E311 : Savais-tu que...Raquette

30s
Where did snowshoes come from? Did you know that it is because of the First Nations that we still use them today!
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E312 : Savais-tu que...Thé médicinal

30s
Lexie presents us with some facts about medicinal tea! This will lead us to discover how people treated themselves in the past.
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E313 : Savais-tu que...Lunette de ski

30s
Through a capsule, Lexie makes us discover the origins of ski goggles. This item is essential to protect the eyes when practicing this sport.
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E314 : Savais-tu que...Gomme à mâcher

30s
Chewing gum has been used for many decades even in the time of the Maya. They used resin. In Canada, it was the First Nations who made this discovery possible.
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E315 : Savais-tu que...Toboggan

30s
In this vignette, Lexie gives us some unusual facts about the history and origins of the toboggan, which is also called the sled.
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E316 : Savais-tu que...Sirop contre la toux

30s
Through a funny and educational capsule, Lexie explains key facts about coughs and the remedies invented by the First Nations.
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E317 : Savais-tu que...Anorak

30s
Lexie explains that anorak is an Inuit word that means a garment to protect oneself from the wind.
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E318 : Savais-tu que...Barbecue

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E319 : Savais-tu que...Mocassin

30s
Lexie explains that moccasins were invented by natives and are one of the oldest kinds of shoes in the world.
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E325 : Savais-tu que ...: Le crabe-araignée géant du Japon

30s
Lexie explains that a Japanese crab can measure up to 3.5m in length and weigh 20 kilos.
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E326 : Savais-tu que ...: Le poisson môle

30s
Lexie explains that the mole fish is a tailless fish that can reach 180cm in length and weigh up to 5000lbs.
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E327 : Savais-tu que ... : Le blobfish

30s
Lexie explains that blobfish is a fish that lives in deep water that strangely resembles a human.
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E328 : Savais-tu que ... : La physalie

30s
Lexie explains that the physalia is a marine animal that looks like a jellyfish and has long filaments that can reach 50m in length.
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E329 : Savais-tu que ... : La taupe à nez étoilé

30s
Lexie explains that a mole found in North America has 22 tentacles at the tip of his nose that allow him to explore his environment and catch food.
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E330 : Savais-tu que... : La grenouille « indian bull frog »

30s
Josée explains that there is a frog in Asia that turns yellow with blue cheeks during the breeding season.
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E331 : Savais-tu que... : Le moucherolle royal d'Amazonie

30s
Lexie explains that there is a bird in the Amazon that has a feather crown on its head that it uses to parade or to scare off predators.
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E332 : Savais-tu que... : Le poisson chauve-souris

30s
Lexie explains that there is a fish that looks like a bat, which explains its name, which crawls at the bottom of the sea with its little paws.
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E333 : Savais-tu que... La fourmi-panda

30s
Lexie explains that an ant found in Chile and South America has hair the same color as a panda, which explains its name, and that its bites are very painful.
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E334 : Savais-tu que ... Le poisson-perroquet bleu

30s
Lexie explains that the parrotfish was so named because of its teeth that resemble the beak of a parrot.
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E335 : Savais-tu que ... Le nasique

30s
Lexie explains that a monkey who lives mostly in Indonesia has a very long nose that is his main asset to attract females.
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E336 : Savais-tu que... Le crabe de cocotier

30s
Lexie explains that coconut crab is the largest crab in the world; it can measure up to 90cm.
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E337 : Savais-tu que... La tortue serpentine

30s
Lexie explains that the snapping turtle has a long neck and lives mostly in Australia.
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E338 : Savais-tu que... Le saïga

30s
Lexie explains that the saiga is the oldest mammal on Earth; although it is endangered, it is still possible to see it in Asia.
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E339 : Savais-tu que... Le pacu (poisson aux dents humaines)

30s
Lexie explains that the Pacu is a fish that lives in the waters of South America that has teeth similar to those of humans.
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E340 : Savais-tu que... Le crabe yéti

30s
Lexie explains that the Yeti crab is covered with white hairs that protect it from the cold as it lives in the waters of the Antarctica.
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E341 : Savais-tu que... Le rat-taupe nu

30s
Lexie explains that there is a hairless mole that can live up to 30 years and lives in Africa.
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E342 : Savais-tu que... La gazelle de Waller

30s
Lexie explains that Waller's gazelle has a longer neck than other gazelles, such as that of the giraffe.
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E343 : Savais-tu que... Le tatou nain d'Argentine

30s
Lexie explains that an animal, the dwarf armadillo, who lives in Argentina, has a carapace on his back and hairs on the rest of his body.
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E344 : Savais-tu que... Le ruban de mer

30s
Lexie explique qu'un poisson, surnommé le serpent des mers, retrouvé dans la plupart des océans, peut mesurer jusqu'à 11 mètres de longueur.
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E345 : Savais-tu que... Lacs canadiens

30s
Lexie explains that Canada has more lakes than any other country in the world combined.
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E346 : Savais-tu que... Ding dong!

30s
Lexie explains that a city in the United States, in the state of Texas, is called Ding Dong
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E347 : Savais-tu que ... La Libye, un pays désertique!

30s
Lexie explains that Libya is a country 99% covered with sand.
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E348 : Savais-tu que... Une colline énorme!

30s
Lexie explains that a New Zealand hill has an unpronounceable name consisting of 85 letters.
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E349 : Savais-tu que... Une boîte aux lettres... sous l'eau!

30s
Lexie explains that there is an underwater mailbox in Japan: special postcards are available for use.
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E350 : Savais-tu que... La Russie, plus grande qu'une planète!

30s
Josée explains that Russia has a larger area than the dwarf planet Pluto.
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E351 : Savais-tu que...Propriétaire du plus de baleines au monde!

30s
Josée explains that a law dating from the 1300s gives the ownership of several kinds of marine animals from British waters to the King or Queen of England.
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E352 : Savais-tu que... Des déchets, s'il-vous-plaît! (Suède)

30s
Josée explains that Swedes buy recyclable waste from other countries to run their power plants.
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E353 : Savais-tu que... Des plantes qui savent compter

30s
Josée explains that, according to German researchers, carnivorous plants called 'fly-catcher' could count to 5.
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E354 : Savais-tu que ... Une guêpe digne d'Harry Potter!

30s
Josée explains that a researcher in New Zealand amateur Harry Potter series has named a new kind of discovered wasp Lucius Malfoy in his honor.
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E355 : Savais-tu que... Concours de craché de châtaignes

30s
Josée explains that there is a contest in France where participants must try to spit a chestnut as far as possible.
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E356 : Savais-tu que... Concours mondial de chandails laids!

30s
Josée explains that there is, in France, a competition of ugliest sweaters.
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E357 : Savais-tu que... une ville de pieuvres

30s
Josée explains that an aggregation of octopus was discovered near Australia, which is interesting for this usually solitary animal.
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E358 : Savais-tu que... Un robot chef d'orchestre

30s
Josée explains that a robot was the conductor of an orchestra in Italy during the closing ceremony of the robot festival in 2017
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E359 : Savais-tu que...Le cadeau du pingouin

30s
Josée explains that the male penguin offers a pebble to the female to seduce her.
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E360 : Savais-tu que... Le chocolat rose naturel

30s
Josée explains that a Swiss chocolatier invented a chocolate that is naturally pink.
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E361 : Savais-tu que ... Poissons rouges de compagnie

30s
Josée explains that a hotel in Belgium offers its customers the opportunity to rent a goldfish during their stay to keep them company.
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E362 : Savais-tu que... Une carotte qui vaut de l'or!

30s
Josée reports that a girl found her mother-in-law's engagement ring by harvesting a carrot from her garden thirteen years later.
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E363 : Savais-tu que ... Un gâteau résistant

30s
Josée explains that a cake made 100 years ago was found in Antarctica during an expedition.
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E364 : Savais-tu que ... Le tigre

30s
Josée explains that the tiger is the largest wildcat in the world and some of these physical characteristics.
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E365 : Savais-tu que...Une danse ou rien!

30s
Josée explains that the male yellow-thighed manakin bird does the moonwalk to impress the females.
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E366 : Savais-tu que.. le pont suspendu le plus long au monde

30s
Josée explains that the longest suspension bridge is in Switzerland and has been open to the public since 2017.
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E367 : Savais-tu que... La plus longue saucisse au monde

30s
Josée explains that the longest sausage was made by the French in 2017 and measured 1km.
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E368 : Savais-tu que...Le moloch horridus

30s
Josée explains that the moloch horridus is a small reptile that lives in Australia. Although he looks repulsive, he is harmless.
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E369 : Savais-tu que...Le narval

30s
À travers des capsules drôles et éducatives, Josée, Lexie et Christopher testent les connaissances des spectateurs sur des sujets passionnants comme l'astronomie, les dinosaures, la faune, la flore, les grandes civilisations et le corps humain. Ils vont même les surprendre avec des faits insolites!
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E370 : Savais-tu que... Le papillon caniche du Venezuela

30s
Josée explains that a butterfly covered with hair was discovered in Venezuela.
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E371 : Savais-tu que ... La ville arc-en-ciel

30s
Josée explains that an Indonesian city on the brink of bankruptcy has decided to paint all its houses in rainbow colors to attract tourists.
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E373 : Savais-tu que... Un castor chef de troupeau

30s
Josée reports that a woman from Canada saw 150 oxen following a beaver.
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E374 : Savais-tu que ... En cas de fin du monde

30s
Josée explains that a bunker was built in Norway to preserve traces of humanity in case of the end of the world.
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E375 : Savais-tu que...Le musée des excréments

30s
Josée explains that there is a museum in Italy that collects cacas. The farmer at the origin of the project wanted to demonstrate all the utilities of the excrements.
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E376 : Savais-tu que...Une grenouille fluorescente

30s
Josée explains that experts have found a frog that, normal color day, becomes fluorescent when exposed to ultraviolet rays.
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E377 : Savais-tu que...Les cactus

30s
Josée explains that there are 2000 different types of cactus that measure from 1.3cm to 19m in height.
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E378 : Savais-tu que...Une sève rouge sang

30s
Josée explains that a tree in Arabia has a dark red sap that is used as a natural dye and in medicine.
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E379 : Savais-tu que...La plante Hydnora africana

30s
Josée explains that an African plant has a foul odor for humans, but attractive to insects so that they promote its reproduction.
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E380 : Savais-tu que...Le phoque à capuchon

30s
Josée explains that the hooded seal has a hood that appears at age 4 and extends from her ears to her muzzle.
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E381 : Savais-tu que...Beauté chez les Mayas

30s
Lexie explains that the Mayans wanted to change the appearance of their children so that they were more beautiful: they put a ball in the middle of the eyes so that they become crooked.
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E382 : Savais-tu que... Les noms des enfants mayas

30s
Lexie explains that the names of the Mayan children were pre-determined according to their date of birth; it was not the parents who chose the name.
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E383 : Savais-tu que... Les saunas chez les Mayas

30s
Lexie explains that the Mayans used saunas: they believed that sweat made diseases disappear.
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E384 : Savais-tu que... Le terrain de jeu mayas

30s
Lexie explains that the Greeks of ancient Greece practice a sport that is a mix of soccer and basketball.
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E385 : Savais-tu que... Le calendrier maya

30s
Lexie explains that the Mayans had three calendars, all of different durations and intentions.
Levels:
Elementary Grade 2 Grade 3 Grade 4 Grade 5 Grade 1
Subjects:
Health and Physical Education Health Science and technology Life Systems
Skills:
Self-Directed Learning
French level:
B1: Threshold Independent User (B1 - B2) A2: Waystage Basic User (A1 - A2)