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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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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
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The human body produces and destroys 15 million blood cells every second.