Health
Discover facts about health. Small discoveries that change the way you see familiar things.
Health
Histoplasmosis hides perfectly in bat droppings
Histoplasma spores can get into dust contaminated by bat or bird droppings. When someone inhales that dust, the spores reach the lungs and can cause flu-like…
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Semen briefly builds a gel and then dismantles it
Proteins called semenogelins form a coagulum after ejaculation. An enzyme from the prostate then cuts up those proteins, helping the mixture liquefy. The…
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Why cartilage injuries can be slow to heal
Cartilage has no direct blood supply, so healing materials cannot arrive through a network of blood vessels the way they can in many other tissues. Cells have…
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Viral vectors hijack invaders for medical tasks
A viral vector uses a virus's talent for getting inside cells, but with its harmful genetic instructions removed. Scientists replace them with therapeutic…
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A slipped disc is like jelly bursting through a ring
A disc doesn't usually slide out of position; its soft inner material can push through a tear in the outer ring. If that bulge presses on a nerve, the trouble…
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A litter-box parasite needs time to become infectious
Toxoplasma shed in cat feces typically takes one to five days to become infectious. That is why daily litter removal matters: it can interrupt the parasite's…
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When an ovarian cyst suddenly ruptures
A cyst can form on an ovary during the monthly cycle and remain unnoticed while it’s intact. If it ruptures, fluid or blood can irritate nearby tissue,…
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How diseases jump from animals to humans
The key is that the germ can live in both an animal and a human. Once it crosses into people with little immunity, it may pass from one person to another…
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Giardia ruins camping trips with tainted water
Giardia can be present in mountain water even when the stream looks sparkling clear; the parasite is too small to see. Drinking contaminated water can lead to…
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Why your joints crack and pop
The sound often comes from gas bubbles forming or shifting in the fluid around a joint. The pop is mostly harmless, though it can announce your attempted…
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Why O-negative is the emergency blood type
Red blood cells carry surface markers, and a mismatch can prompt the recipient's immune system to attack them. O-negative cells lack the main A, B, and Rh(D)…
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Fingerprints form as tiny waves of ridges meet
Before birth, molecular signals guide growing ridges across a fingertip. A 2023 study found that where those waves begin and how they meet help determine…
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Babies taste with more than just their tongues
A baby’s taste receptors are spread across parts of the mouth, not just the tongue. Those receptors detect chemicals in food, and their distribution can make…
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Daily steps can add up to a thousand-mile journey
At an assumed step length of 2.5 feet, 7,500 steps a day add up to roughly 1,300 miles in a year. Most of that distance can disappear into commutes, errands…
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Men are more prone to prolonged hiccups
A hiccup happens when the diaphragm—the muscle beneath the lungs—spasms and pulls in air, then the vocal cords snap shut to make the familiar “hic.” In…
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Plaque can turn into a crust your toothbrush can't remove
The soft bacterial film on teeth can mineralize into tartar if it remains in place. At that point, routine brushing no longer removes the deposit;…
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Why energy drinks are tough on your teeth
Acid can soften and dissolve minerals in tooth enamel, while sugar gives mouth bacteria fuel to make more acid. Put both in the same drink and teeth face a…
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Why gel manicures can leave nails paper-thin
The nail underneath the gel is a stack of thin, protective layers. If removal means forcefully scraping or filing off stubborn polish, some of those layers…
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What can happen when you skip flossing
The hidden risk is not just food caught between teeth: the buildup can trigger gum inflammation. If it continues, the inflammation can damage supporting bone,…
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Why pregnancy can change your voice
Pregnancy hormones can make tissues retain more fluid, including the delicate vocal folds that vibrate to create your voice. If those folds swell, they…
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Most household falls occur directly in the bathroom
A bathroom can turn one slippery step into a dangerous fall: pooled water reduces grip, and tile or ceramic offers a hard landing. The risky moment may be as…
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Your pancreas responds to a snack before you think about it
As blood sugar rises after eating, the pancreas releases insulin, helping glucose move into cells. As glucose falls, insulin output falls too. Frequent snacks…
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A C-section heals beneath the surface for months
A C-section incision is more than a line in the skin: the surgery passes through multiple layers of tissue. The surface may close first, while deeper layers…
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A hospital experiment made processed food's effect visible
Twenty adults spent a month at an NIH clinic, trying ultra-processed and minimally processed menus in turn. When allowed to eat as much as they wanted, they…
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