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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.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.