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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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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
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There are more sensory neurons in the tongue than in any other part of the body.