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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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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.