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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The longest a person has survived after a heart transplant is 24 years.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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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.