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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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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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In 1864, the first barbiturate (barbituric acid) was synthesized.