The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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