Life
- Climate
5 things to know about the climate-saving benefits of tree planting
A recent analysis of the benefits of massive efforts to plant more trees triggered a firestorm of controversy.
- Brain
Surprise! Exam scores benefit from months of regular sleep
Getting enough consistent, quality sleep accounted for nearly a fourth of the differences in students’ exam scores in class.
- Microbes
Drug-resistant germs kill some 35,000 Americans each year
The new mortality rate may be way low, some experts say. Also troubling are two new germs that have emerged as big and urgent threats.
- Animals
Whales echolocate with big clicks and tiny amounts of air
Toothed whales may echolocate using bits of air that they recycle inside their heads to conserve both air and energy.
- Brain
As teens gain weight, they find high-fat foods less pleasurable
Teens who gained excess weight showed less activity in the brain’s reward center when viewing or tasting foods with lots of fat.
- Life
Scientists Say: Nutrient
Nutrients provide living things, from bacteria to animals, with the energy and materials to grow. But too much of a nutrient can sometimes cause harm.
- Tech
Drones help scientists weigh whales at sea
Drone imagery lets scientists estimate a whale’s weight. And that may help monitor the health of these big mammals for conservation purposes.
- Brain
Sleep may jumpstart the brain’s power washing system
Waves of fluid wash into the human brain during sleep. That’s good. They just may help clean out toxic proteins.
- Animals
Scientists Say: Papillae
These small nubs stick out from a body part. They include things such as tongue bumps with taste buds and the structures under the skin that help grow hair.
- Animals
Why are bird eggs in cold climates darker colored?
A global survey of bird egg color has revealed a simple trend: the colder the climate, the darker the egg.
- Chemistry
Scientists look to hack photosynthesis for a ‘greener’ planet
Photosynthesis turns sunlight into energy for plants. Scientists want to know more about it, imitate it — even improve it.
- Animals
Piranhas and plant-eating kin replace half their teeth at once
Piranhas and pacus shed and replace half of their teeth at a time. New teeth lock together as they push up from the jaw.
