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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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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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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.