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Did you know?
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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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 human body produces and destroys 15 million blood cells every second.