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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.