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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.

Lexie explains that, despite its name, the large intestine is shorter than the small intestine and is about 1.5m long.

Lexie explains that the skin is the largest and heaviest organ of the human body.

Lexie explains that the kidneys are very important organs in the body because they eliminate the waste that travels in the blood.

Lexie explains that the human body works very well with just one healthy kidney.

Lexie explains that one third of the tongue is not visible and helps to get food down the throat.

Lexie explains that the skin is covered with millions of bacteria that help protect against diseases.

Lexie explains that bones grow and become stronger until the age of 16 for girls and 20 for boys.

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.

Lexie explains that the smallest bone of the human body is in the ear and is called the stirrup.