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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.

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.

Lexie explains that bones repair themselves when they break; however, they need to be immobilized to get there.

Lexie explains that the smallest organ of the human body is in the brain and is called the epiphysis.

Lexie explains that there are more than 600 different types of bacteria on the tongue that cause bad breath.

Lexie explains the name and role of the three inner parts of the ear.

Lexie explains that the heart is the muscle that works the most in the human body.

Lexie explains that there are more than 60,000 thoughts running through the mind during a day.

Lexie explains that some bones merge when they grow up, so that an adult's body has less bone than a child's body.