Uncategorized
- Health & Medicine
Legalizing pot may confuse teens into thinking it’s safe
A growing number of teens think marijuana is no big deal, a new study finds. And that may encourage many to experiment with its use.
- Earth
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.
- Life
Fleets of flying robots could pollinate crops
Tiny flying drones use patches of sticky hair to capture pollen. One day they might join bees in pollinating crops.
- Plants
Scientists Say: Guttation
When water vapor can’t escape a plant, it might force its way out through a process called guttation.
- Computing
Single atoms become teensy data storage devices
Most people consider a thumb drive to be an amazingly small device for storing data. But this new system uses a ten-thousandth the number of atoms of today’s data-storage devices.
- Ecosystems
Cities drive animals and plants to evolve
Biologists are finding that some species have used genetic changes to evolve — adapt — to the pollution and other stressors that they encounter in cities.
- Brain
Study links ADHD to five brain areas
A new international study shows that the brains of children with ADHD are different from those in people without this condition.
- Physics
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.
- Animals
Wild elephants sleep for only two hours at night
New measurements suggest that wild elephants may need less sleep than any other mammal.
- Plants
Scientists Say: Stomata
Plants have pores they open and close to let oxygen, carbon dioxide and water vapor in and out. These pores are called stomata.
- Fossils
Fossils offer new candidate for earliest life
Rock unearthed in Canada appears to hold fossils from seafloor microbes that would have lived around 4 billion years ago, when Earth was very young.
- Brain
Anxious about math? Your brain may tackle simple problems differently
A study found more variable brain activity in people who get nervous about math problems than those who do not.
