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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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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.