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If you could remove all of your skin, it would weigh up to 5 pounds.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
![Rhytidoplasty. This is a common form of plastic surgery in which the skin is pulled and sutured to d](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_10_36_100181200.jpeg)
![Phlebotomy. In this common procedure, a syringe needle punctures a vein, usually in the arm, and wit](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_15_46_100322221.jpeg)