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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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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.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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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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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.