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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.