Matter and Its Interactions
- Health & Medicine
Explainer: All about the calorie
Calories are a measure of how much energy is in a food. But when it comes to powering our bodies, not all calories are equally available to the body.
- Tech
Teen’s invention could help light up bikes at night
A teen researcher from Georgia has developed a light that could replace reflectors on bike wheels. Flexing tires provide all the power it needs.
- Health & Medicine
This mix turns pink when sunscreen wears thin
Many people know to put on sunscreen. Remembering to put more on is harder. A teen invented an indicator that glows pink when it’s time to reapply.
- Tech
Tweaked germs glow to pinpoint buried landmines
Finding landmines could become much safer with a new technology. It uses genetically modified bacteria that glow under laser light.
- Tech
A better way to stop a bullet?
A teen researcher's tests suggest that fabric body armor might stop bullets better if it were woven using a three-fiber, triangular mesh instead of the typical two-fiber-mesh configuration.
- Physics
After 30 years, this supernova is still sharing secrets
It’s been 30 years since astronomers first witnessed the stellar explosion known as SN 1987A. Today, researchers are still learning from this cataclysmic phenomenon.
- Materials Science
Nanowires made from silver are super stretchy
When silver nanowires stretch slowly, atoms on their surface can spread to heal weak spots. The discovery could lead to more flexible electronics.
- Planets
How Earth got its moon
How did our moon form? Scientists are still debating the answer. It may be the result of some one big impact with Earth — or perhaps many small ones.
- Tech
Auto-focus eyeglasses rely on liquid lenses
Engineers have designed what could be the last eyeglasses anyone would need. Right now, they’re bulky but smart. Liquid lenses are key to their adjustability — and those lenses focus automatically.
- Environment
Did your burger come with a side of non-degrading pollutants?
Perfluorinated compounds pollute the environment and might harm human health. A new study shows that one place they often show up is the paper and cardboard used to package fast foods.
- Science & Society
Will we know alien life when we see it?
The hunt is on for extraterrestrials. But recognizing them may require some wiggle room in what we define as being alive.
- Animals
Cool Jobs: A world aglow
Three scientists probe how the natural world makes light, in hopes of using this information to design new and better products.
