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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The average office desk has 400 times more bacteria on it than a toilet.