Savais-tu que.. La Grande Muraille

Christopher explains that our breath becomes white when it is cold, because it turns into small droplets of water in contact with the cold.

Christopher explains that the human body emits light that is not visible to the naked eye.

Christopher explains that humans and bananas have 50% of their DNA that is similar.

Christopher explains that the energy produced by the brain would be powerful enough to light a light bulb.

We measure up to 2 centimeters taller when we wake up. Christopher introduces us to this phenomenon.

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.

Christopher explains that the brain needs water to work well, so it's important to drink plenty of water throughout the day.

Christopher explains that the color of the tongue can express a person's state of health.

Christopher explains the role of each hemisphere of the brain.

Christopher explains that identical twins are called monozygotes because they are two sperm that fertilized the same egg that subsequently split.

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.

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.

Christopher explains that the amount of melanin production in our body determines the color of the skin.

Christopher explains the process of digestion and how it begins in the mouth with teeth that cut food into small pieces.

Christopher explains that dust is made up of many things including dead skin cells.