Health
Discover facts about health. Small discoveries that change the way you see familiar things.
Health
Why you don't hear your name when you're focused
When you're absorbed in reading or a game, your attention can filter out sounds, even someone saying your name. Hearing is not the same as noticing: your ears…
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Somatostatin inhibits competing hormone release
Somatostatin acts like a brake on hormone release, slowing growth hormone and other secretions. That helps keep the body’s hormone signals regulated rather…
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A vegetable-colored chip can still be mostly starch and oil
Some veggie snacks get their color from small amounts of vegetable powder added to a starch-based mixture. Frying or baking that mixture doesn't turn it into…
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Could dark chocolate be good for your heart
Cacao flavanols can help blood vessels relax and widen, which can lower blood pressure. Dark chocolate with 70% cacao is one source, though the useful…
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Floss cleans the tooth surfaces your brush struggles to reach
Sliding it along the sides of neighboring teeth disrupts plaque between them. Used floss can fray and carries what it has already removed, which is why it is…
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Your body keeps spending energy while you sleep
Breathing, circulation, temperature regulation, and brain activity continue even when you barely move. Metabolic rate also changes through the night rather…
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Your eyeball is filled with clear jelly
A clear gel called vitreous humor fills the space behind the lens and in front of the retina. It helps the eyeball hold its rounded shape, like transparent…
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Shake weights relied completely on dynamic shifting inertia
As the weighted handle changes direction, its momentum keeps shifting, and your arms have to work quickly to control it. That makes stabilizing muscles fire…
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Pus is made partly from dead immune cells
When neutrophils arrive at infected tissue, they release antimicrobial chemicals and can die in the process. Their corpses become part of the pus, along with…
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Coffee isn't dehydrating after all
Caffeine can nudge urine production upward, while the coffee itself supplies fluid. With a normal cup, the water more than balances that mild effect, so…
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Neanderthal genes may affect your hair texture
Hair texture is partly guided by genes that influence how follicles produce each strand. Some Neanderthal-derived variants still found in people today may…
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Why you shouldn't brush right after drinking soda
Soda’s acids temporarily soften the enamel covering your teeth. Scrubbing while it’s softened can wear more of that surface away, so waiting about an hour…
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Tongue scraping evicts microscopic oral squatters
Bacteria can live in the coating on the tongue and contribute to odor. A scraper removes some of that coating directly, clearing away microscopic residents…
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After a hard workout, immune cells change location
Some immune-cell counts fall in the bloodstream after strenuous exercise. That drop helped popularize the idea of an immune “open window,” but researchers…
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Raw flour can carry E. coli
The grain is milled into flour, but the flour gets little processing afterward. If E. coli is present, it can remain alive in the powder; baking supplies the…
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Why muscle takes up less space than fat
The scale weighs pounds, not the space they fill. Because a pound of muscle takes up less room than a pound of fat, replacing some fat with muscle can change…
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O-negative blood: universal donor, limited receiver
O-negative red cells can be given to many people in an emergency because they don’t display A, B, or Rh(D) markers. The compatibility runs one way: a person…
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Medieval bathhouses became centers of prostitution
Public bathhouses were places to wash and gather, and some also hosted prostitution. That overlap brought condemnation from religious leaders, who sometimes…
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Human blood strictly regulates its exact pH balance
Your blood can’t let its acidity drift much, so chemical buffers, the lungs, and the kidneys work together to keep its pH in a narrow range. Alkaline water…
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Green mucus doesn’t automatically mean you need antibiotics
White blood cells release myeloperoxidase, an enzyme that can give mucus a green color as they respond to infection. That color can show up with viral or…
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Myocardium constitutes the absolute thickest cardiac layer
The myocardium is the heart wall’s thick middle layer, made of muscle. When it contracts, it squeezes blood out of the heart; the thinner layers inside and…
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Your fingerprints may make smooth surfaces harder to grip
A fingerprint is not simply extra traction. Its ridges may reduce contact with a smooth surface, yet their movement can create stronger vibrations in the…
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Why slouching can make positive memories harder to recall
A slump can shape more than your back: it may put the brain in a more defensive, stress-oriented state. That can make negative thoughts easier to retrieve,…
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Nail polish can leave its color behind after you remove it
Pigments from some polishes can stain the nail plate, especially strong reds and oranges. Dermatologists note that discoloration may take weeks to fade when…
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