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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.