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Did you know?
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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.