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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The average office desk has 400 times more bacteria on it than a toilet.
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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
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The human body produces and destroys 15 million blood cells every second.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.