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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.