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Your heart beats over 36 million times a year.
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There are more bacteria in your mouth than there are people in the world.
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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 ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.