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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The human body produces and destroys 15 million blood cells every second.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.