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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).