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Did you know?
There are 60,000 miles of blood vessels in every adult human.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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There are more bacteria in your mouth than there are people in the world.