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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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.