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Did you know?
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The average adult has about 21 square feet of skin.
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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.