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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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There are more sensory neurons in the tongue than in any other part of the body.