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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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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The average adult has about 21 square feet of skin.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Negative feedback as a mechanism by which homeostatic control systems operate.
