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Your heart beats over 36 million times a year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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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There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.