Health
Discover facts about health. Small discoveries that change the way you see familiar things.
Health
Why the ten-percent brain myth is wrong
Brain scans show activity across nearly all parts of the brain, even when you’re asleep or passively watching something. That doesn’t mean every cell is…
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Oogenesis wastefully discards three polar bodies for one egg
As an egg develops, its cell divides unevenly: one daughter cell keeps nearly all the cytoplasm and cellular machinery, while the others get very little.…
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Early braces were metal cages for your teeth
Delabarre's wire crib enclosed the teeth in metal and pushed them toward alignment. Teeth are not fixed like nails in wood; pressure can lead the surrounding…
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Pufferfish harbor lethal toxins lacking an antidote
Tetrodotoxin blocks the signals nerves use to activate muscles. As those signals fail, paralysis can spread to the muscles needed for breathing; there is no…
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Mitochondrial DNA is inherited entirely from mothers
An egg supplies the embryo’s mitochondria, while sperm mitochondria are generally not passed on. That’s why mitochondrial DNA—the small set of genes inside…
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Why crunches can't target belly fat
A crunch burns energy and trains the muscles underneath your belly, but it cannot choose which fat stores supply that energy. Your body draws from different…
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Interval timer techniques maximize focus enforcing breaks
The technique gives a work session a clear edge: after 25 minutes, the timer calls for a pause. It turns taking a break from something you have to remember…
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Why stretching cold muscles can hurt your workout
A hard stretch can pull on cold muscle before it is ready, increasing the chance of tiny tissue damage. Holding a static stretch may also briefly reduce…
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Jet lag is your organs stuck in different time zones
Jet lag lingers because your body runs several clocks, and they don’t reset together. Your brain may register daytime while clocks in other tissues still…
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Myosin heads pull your muscle fibers
Inside a muscle, myosin heads attach to actin filaments and pull them past one another. Millions of these tiny pulls add up, so the filaments slide and the…
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Fallopian tubes do not actually connect to the ovaries
After an ovary releases an egg, the egg does not drop into a sealed tube. The tube’s open, fringed end sits close by and helps guide the egg across the small…
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Plant-based milks naturally lack protein
A creamy texture does not tell you how much protein is in a plant-based milk. Many have far less than dairy unless protein has been added, so checking the…
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You can't catch the flu from cold air
Influenza needs a virus, but winter helps create opportunities for it to spread: people spend more time together indoors. Being cold and catching an infection…
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Nutmeg can turn a cozy drink into a nightmare
Myristicin, a chemical in nutmeg, can disrupt normal brain signaling when someone takes a large amount. The result can be delirium and severe nausea, with…
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Cocaine directly blocks electrical signals in cardiac tissue
Electrical signals travel through heart tissue partly by passing through sodium channels. Cocaine can block those channels, interrupting the timing that keeps…
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Your heart moves roughly a whole blood volume each minute
At rest, an adult heart commonly pumps around five liters per minute, similar to the amount of blood in the body. That does not mean every cell takes an…
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Why one bad jar can cause botulism
A sealed jar creates the oxygen-free conditions botulism-causing bacteria can thrive in, and low-acid vegetables do not provide enough acidity to stop them.…
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Your vocal cords can shut to keep water out
The vocal folds can snap closed when water irritates the area around the airway. That reflex acts like a gate against liquid reaching the lungs, but it…
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Why swallowing one fry takes 50 pairs of muscles
Your tongue pushes the fry backward while muscles close off the route to your lungs and open the route to your stomach. Dozens of paired muscles have to move…
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The tongue map taught in school is wrong
Sweet, salty, sour, bitter, and savory are not confined to separate strips of your tongue. Cells responding to these tastes are distributed across it. The…
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Why bourbon can mean a worse hangover than vodka
Bourbon carries more fermentation byproducts called congeners than vodka, and those compounds can add to hangover symptoms. They are not the whole story, but…
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Using a drinking straw strictly bypasses your front teeth
A straw can direct coffee or tea behind the front teeth, so those visible surfaces get less contact with the dark drink. It doesn’t make the drink vanish from…
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Why hand sanitizer leaves your skin so dry
Alcohol in hand sanitizer dissolves some of the oils that help keep your skin’s outer layer supple. As the sanitizer evaporates, your hands can feel tight and…
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Muscle tissue accounts for roughly forty percent of mass
Muscle makes up roughly 40 percent of body mass, with the exact share varying from person to person. Its fibers create movement by pulling when they contract,…
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