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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).
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.