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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.