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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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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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There are more sensory neurons in the tongue than in any other part of the body.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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.