6,871 results
6,871 results for: Bears
-
- Earth
Mangled microfossils may mark impact sites
Scientists studying sediment cores drilled in eastern Virginia say they’ve possibly identified a new clue to the locations of ancient, hidden impact craters: Just look for broken or twisted microbial fossils.
- Ecosystems
Cryptic Invasion: Native reeds harbor aggressive alien
A mild-mannered reed native to the United States is getting blamed for the mayhem caused by an evil twin.
- Chemistry
Delivering the Goods
Experimental gene-delivery therapies generally use viruses to shuttle genetic material into cells, but some researchers are devising ways to avoid using the sometimes-risky viruses.
-
How the Butterfly Gets Its Spots
The spots on a butterfly wing turn out to be unusually good model systems for a range of disciplines from genetics to behavioral ecology, offering biologists a chance to paint the really big picture of how evolution works.
- Anthropology
Evolution’s Surprise: Fossil find uproots our early ancestors
Researchers announced the discovery of a nearly complete fossil skull, along with jaw fragments and isolated teeth, from the earliest known member of the human evolutionary family, which lived in central Africa between 7 million and 6 million years ago.
-
Red Snow, Green Snow
It's truly spring when those last white drifts go technicolor as algae bloom in the snow.
-
- Materials Science
Steely Glaze: Layered electrolytes control corrosion
Experiments with ultrathin organic coatings applied to steel suggest a new technique for slowing corrosion.
- Math
Tilt-A-Whirl Chaos (I)
Tilt-A-Whirl. Sellner Manufacturing Co. Schematic drawing (top view) showing the Tilt-A-Whirl’s geometry. Much of the fun of an amusement park ride results from its stomach-churning, mind-jangling unpredictability. The Tilt-A-Whirl, for example, spins its passengers in one direction, then another, sometimes hesitating between forays and sometimes swinging abruptly from one motion to another. A rider never […]
- Archaeology
Almond Joy, Stone Age Style: Our ancestors had a bash eating wild nuts
New finds at a 780,000-year-old Israeli site indicate that its ancient residents used stone tools to crack open a variety of hard-shelled nuts that were gathered as a dietary staple.
-
