6,907 results
6,907 results for: Bears
- Archaeology
Stone Age Combustion: Fire use proposed at ancient Israeli site
A Stone Age site in Israel contains the oldest evidence of controlled fire use in Asia or Europe, from around 750,000 years ago, a research team reports.
- Earth
Harm from Plastic Additive Challenged: Early exposure shows no ill effects
Presumed exposure shortly after birth to a chemical ingredient in plastics shows no evidence of disrupting development in people, according to a small study of teens who, as newborns, received intensive medical care involving plastic hospital equipment.
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Bubble Trouble: Mad cow proteins may hitch a ride between cells
Prions, the proteins behind mad cow disease, may travel between cells in bubbles called exosomes.
- Animals
Jumping spiders buzz, thump when dancing
Some jumping spiders, long considered visually oriented animals, turn out to utilize seismic communication for a successful courtship.
- Earth
Quick Bite: Some gorges carved surprisingly fast
Analyses of rock samples from two river gorges along the Atlantic seaboard suggest that the largest parts of those chasms were carved during a geologically short period at the height of the last ice age.
- Earth
Dangerous Dust? Chemicals in plastics are tied to allergies
Elevated risks for developing multiple allergies, including asthma, eczema, and rhinitis, appear to be associated with household exposure to synthetic chemicals called phthalates.
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Gutless Wonder: New symbiosis lets worm feed on whale bones
A newly discovered genus of marine worm can take nourishment from sunken whale skeletons, thanks to a previously unknown form of symbiosis.
- Chemistry
Velcro Therapy: Branching polymer wards off scarring after eye surgery
Specially designed polymer molecules called dendrimers reduce scar tissue formation after glaucoma surgery, dramatically improving the procedure's outcome.
- Tech
Quantum dots light up cancer cells in mice
Brightly fluorescent crystals known as quantum dots have the potential to seek out cancerous cells in the body, a trick that could lead to highly precise cancer screening.
- Paleontology
Growth Spurt: Teenage tyrannosaurs packed on the pounds
Detailed analyses of tyrannosaur fossils suggest that the creatures experienced an extended growth spurt during adolescence.
- Health & Medicine
Joint Effort: Bacteria in yogurt combat arthritis in rats
Yogurt containing certain types of live bacteria may help prevent or treat arthritis.
- Earth
They’re not briquettes, but they’ll do
Chunks of fossil charcoal found in ancient sediments in north central Pennsylvania suggest that cycles of wildfire plagued Earth more than 360 million years ago.
