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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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In 1864, the first barbiturate (barbituric acid) was synthesized.