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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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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.