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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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There are 60,000 miles of blood vessels in every adult human.
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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.