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Did you know?
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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.