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There are 20 feet of blood vessels in each square inch of human skin.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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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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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.