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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.