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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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There are more sensory neurons in the tongue than in any other part of the body.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.