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The human body produces and destroys 15 million blood cells every second.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

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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.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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