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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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There are more bacteria in your mouth than there are people in the world.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.