Savais-tu que... Civilisations anciennes/Corps humain

Lexie explains that a liquid in the ears helps to keep the balance.

Eyebrows are more useful than you think. Lexie explains why they are essential for the protection of our eyes.

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.

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!

Lexie shows us how to hear our own voice. Did you know that you can hear it? Just follow Lexie's advice.

The body has many surprises and reactions. Did you know that your heart slows down when you swim in cold water?

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.

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.

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?

In this video, Lexie introduces us to the phenomenon of color perspective. Did you know that we can only see 3 colors?

Christopher explains that the Incas had factors that were responsible for transmitting messages across the empire through suspended bridges.

Christopher explains that the Incas were already doing surgeries more than 3000 years ago to try to heal the wounds of war.

Christopher explains that it was the Incas who cultivated the first potatoes.

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.

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.