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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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If you could remove all of your skin, it would weigh up to 5 pounds.

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Your heart beats over 36 million times a year.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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Anti-aging claims should not ever be believed. There is no supplement, medication, or any other substance that has been proven to slow or stop the aging process.

The “Infertility Belt” In certain countries in Central Africa, infertility rates are as high as 30% The “Infertility Belt” In certain countries in Central Africa, infertility rates are as high as 30%
W. A. Rogers’s engraving, “Out of the Game,” showed one injured boy tending to another. It appeared W. A. Rogers’s engraving, “Out of the Game,” showed one injured boy tending to another. It appeared
Richard Rodriguez represents millions of immigrants—not just those of Latino origin but those from ... Richard Rodriguez represents millions of immigrants—not just those of Latino origin but those from ...
The primary factors affecting blood pressure. The primary factors affecting blood pressure.
Factors for Tolerance Intervals Factors for Tolerance Intervals
Formation of a DNA loop allows factors that bind to an enhancer or silencer Formation of a DNA loop allows factors that bind to an enhancer or silencer
Video: Automated external defibrillator (AED)

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