Uncategorized
- Paleontology
Reptilian Repast: Ancient mammals preyed on young dinosaurs
Two nearly complete sets of fossilized remains from 130-million-year-old rocks are revealing fresh details about the size and dietary habits of ancient mammals, hinting that some of these creatures were large enough to feast on small dinosaurs.
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19503
The model for the emergence of a population of “cheaters” out of a population of “cooperators” described in this article gives a fresh viewpoint on existing ecosystems—and much more. Might the evolution of asymmetric modern sex from symmetric DNA exchange (like that practiced by paramecia) have been one special case of this emergence? If so, […]
- Math
When Laziness Pays: Math explains how cooperation and cheating evolve
Researchers have developed a mathematical model that helps explain how cooperation and cheating evolve among simple organisms.
- Astronomy
Ultimate Retro: Modern echoes of the early universe
Two teams of astronomers have for the first time detected the surviving notes of a cosmic symphony created just after the Big Bang, when the universe was a foggy soup of matter and radiation.
- Humans
Letters from the January 15, 2005, issue of Science News
Maybe a smoky card game I’m a veterinarian, and, here in west Texas, we see a high occurrence of parvovirus infection in young dogs. It destroys the intestinal villi, allowing gastrointestinal bacteria and their toxins to enter the bloodstream (“Nicotine’s Good Side: Substance curbs sepsis in mice,” SN: 11/6/04, p. 291). I would be very […]
- Health & Medicine
Antibiotics could save nerves
Penicillin and its family of related antibiotics may prevent the type of nerve damage that occurs in people with amyotrophic lateral sclerosis (ALS) and other diseases.
- Animals
Sparrows learn song from pieces
Young white-crowned sparrows don't have to hear a song straight through in order to learn it; playing the song in mixed-up paired phrases will do.
- Earth
Really hot water
Hot-water tanks can accumulate radioactive deposits from naturally occurring radioactive material.
- Earth
Landscaping stones may pose risks to the environment
Chemical analyses suggest that planting ornamental rock gardens in some cases may not be doing the environment any favors.
- Earth
Big quakes can free grounded icebergs
Data gathered by equipment installed on an immense iceberg off Antarctica suggest that the ground motions spawned by large, distant earthquakes can free such bergs to float again.
- Earth
Seismic vibes gauge Earth’s crust
New seismic observations are adding to scientists' knowledge of the thickness of Earth's crust, especially in the Southern Hemisphere.
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19502
As an occasional betel nut chewer, I note that this report doesn’t touch on possible positive aspects of the habit. Chewing sapari (coarsely powdered, sweetened, and clove-flavored areca nut) at the end of a meal leads to a sense of satisfaction and well-being, induces salivation, and freshens the mouth. Areca nut also contains lots of […]
