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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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.