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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).
Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
Everyone has one nostril that is larger than the other.
There are 20 feet of blood vessels in each square inch of human skin.