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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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.