Uncategorized
- Health & Medicine
Exercise after breast cancer extends life
After a woman survives an initial bout with breast cancer, being physically active improves her odds of beating the disease over the long term.
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19403
In this article, the photo comparison of the dam site is deceptive because the two photos of the same spot appear to have been taken during different seasons. Hence, the lower photo shows a scene that appears excessively desolate, but not because of the loss of the dam. Michael C. ReedKalamazoo, Mich.
- Earth
Tales of the Undammed
Although destroying dams is often presumed to restore rivers, the results of such action are actually mixed, according to recent studies.
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Quite a Switch
Cells use ribonucleic acids that bind to small molecules such as vitamins to control gene activity.
- Humans
From the March 31, 1934, issue
A desert earthquake, producing bromine from seawater, and nerve damage from alcohol consumption.
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Understanding Evolution
Understanding Evolution is an extensive Web site designed to meet the needs of K–12 teachers presenting evolution in the classroom. Developed by the University of California Museum of Paleontology at Berkeley and the National Center for Science Education, the site provides an informal online course covering essential science content, as well as a searchable database […]
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19402
When I was a teenager, I lived with a brown capuchin monkey. Among other games, we enjoyed trading: his poker chips for my food. When he was out of poker chips, he would improvise by finding pebbles, paper, toys, and other household detritus to trade. When all was traded into my pile, he would give […]
- Anthropology
Monkey Business
They're pugnacious and clever, and they have complex social lives—but do capuchin monkeys actually exhibit cultural behaviors?
- Plants
A Frond Fared Well: Genes hint that ferns proliferated in shade of flowering plants
Analyses of genetic material from a multitude of fern species suggest that much of that plant group branched out millions of years after flowering plants first appeared, a notion that contradicts many scientists' views of plant evolution.
- Tech
Soaring at Hyperspeed: Long-sought technology finally propels a plane
For the first time, an airplane flew at hypersonic speed under power of a scramjet, an engine that operates at high velocities using oxygen from the atmosphere.
- Astronomy
Foraging among the Galaxies: Andromeda’s dining habits are documented
A new survey is adding to the evidence that Andromeda, the Milky Way’s sister galaxy, has not only grown bigger in the past by feasting on smaller galaxies but is continuing to do so.
- Health & Medicine
Better-Off Circumcised? Foreskin may permit HIV entry, infection
Circumcision seems to offer partial protection against HIV infection, but not other sexually transmitted diseases.
