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Did you know?
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The average adult has about 21 square feet of skin.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.