Uncategorized
- Animals
Hawk skin sends UV signal
The patch of skin above a hawk's beak looks orange-yellow to us, but to another hawk, it may broadcast ultraviolet sex appeal.
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19643
Some of the descriptions about confusion of self contained in your article were very reminiscent of the confusion I often sense in dreams. I even recognize in some dreams the sensation described in the article about various body parts not being part of “me.” I wonder if this aspect of normal (I assume) dreaming has […]
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Self-Serve Brains
New brain-imaging studies and investigations of certain types of brain damage suggest that the right hemisphere typically coordinates one's sense of being a self, with a body and a set of life experiences distinct from those of other people.
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19642
Why is it that visible light is shifted to lower frequencies but gamma rays aren’t? Shouldn’t they have become X rays after all that distance? Stephen WoodOrlando, Fla. All wavelengths are redshifted. That means that high-energy gamma rays beyond a detector’s energy range would get shifted into the detectable range by cosmic expansion, while slower-energy […]
- Astronomy
Blasts from the Past
Gamma-ray bursts may soon surpass quasars and galaxies as the most distant known objects in the universe and are likely to provide a new window on the early universe.
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- Animals
Cyber Salmon
To learn about chum, chinook, and coho salmon, try this Web site from the Alaska Region of the U.S. Fish and Wildlife Service. Learn about the people of Alaska, several salmon species, and salmon habitat. The site includes salmon-related activities and lesson plans for various grade levels. Go to: http://cybersalmon.fws.gov/index.html
- Humans
From the February 1, 1936, issue
Groundhog Day, a new dental pain-killer, and a glarefree optical material dubbed polaroid.
- Animals
Bird-Safe Rx: Alternative drug won’t kill India’s vultures
Researchers have found an alternative to the livestock drug that has accidentally poisoned a majority of the vultures in India and neighboring countries.
- Health & Medicine
Protecting People from a Terrifying Toxin: Vaccine stimulates immune response against ricin
In its first test in people, a vaccine against the toxin ricin appears safe and generates antibodies that are expected to be protective against the potential bioterrorism agent.
- Earth
Cold and Deep: Antarctica’s Lake Vostok has two big neighbors
Trapped beneath Antarctica's kilometers-thick ice sheet are two immense bodies of water that may harbor ecosystems that have been isolated for millions of years.
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Good for Something: Prion protein maintains stem cells
The same protein that, in an altered shape, causes mad cow disease maintains the body's cache of blood-producing stem cells.
