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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.
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The longest a person has survived after a heart transplant is 24 years.
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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 kidneys will clean about 1 million gallons of blood in an average lifetime.