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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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The horizontal fraction bar was introduced by the Arabs.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.