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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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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.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.