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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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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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If you could remove all of your skin, it would weigh up to 5 pounds.