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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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.