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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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There are 60,000 miles of blood vessels in every adult human.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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.