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Did you know?

About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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The average adult has about 21 square feet of skin.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

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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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Video: Action potentials - electrical characteristics and generation

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