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There are 20 feet of blood vessels in each square inch of human skin.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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).