Uncategorized
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Brain Gain
The brain constantly sprouts new neurons, a recently discovered phenomenon that neuroscientists and drugmakers are working to understand and harness.
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19843
Your article states, “Exercise, estrogen, [and more examples] all rev up production of new brain cells.” I am compelled to ask: If estrogen leads to neurogenesis, does the “male” hormone testosterone also? Jaime HunterMesquite, Texas There’s good evidence that testosterone increases neurogenesis in songbirds but little evidence that it does the same in mammals. —B. […]
- Humans
Letters from the June 16, 2007, issue of Science News
Bigger picture Reading “Pictures Posing Questions: The next steps in photography could blur reality” (SN: 4/7/07, p. 216), I was struck by the similarity between the image that used a cone-shaped mirror and the images you get from gravitational lensing. As the same data are available in both types of images, it ought to be […]
- Humans
From the June 5, 1937, issue
All lit up in Paris, changing elements, and cheap, accurate lenses.
- Humans
Scitopia.org
This new site is a search portal to the digital libraries of leading science and technology societies. Enter a term into its search engine to find authoritative research, patents, and government documents. Go to: http://www.scitopia.org
- Math
Musical Illusions
An auditory phenomenon that resembles a familiar optical illusion sheds light on how our brains process sound.
- Earth
Storm Norms: Caribbean corals and sediments yield clues to hurricane frequency
The recent increase in hurricane activity in the North Atlantic, a phenomenon that some scientists blame on climate change, actually reflects a return to normal after a lull in the 1970s and 1980s.
- Astronomy
Galactic Émigré: Incoming dwarf galaxy could feed its larger kin
A dwarf galaxy at the periphery of the giant Andromeda galaxy may be a pristine building block for forming galaxies in the modern-day universe.
- Animals
Scary Singing: Precise birds signal, ‘Don’t mess with us’
A pair of magpie-larks can advertise their toughness by the precision of the duets they sing.
- Health & Medicine
Blending In: Dissolvable stents promise to protect arteries
A biodegradable magnesium stent props open clogged blood vessels and then dissolves, circumventing the problems linked to permanent metal stents.
- Anthropology
Chicken of the Sea: Poultry may have reached Americas via Polynesia
Polynesians may have traveled back and forth to South America more than 600 years ago, introducing chickens to the Americas in the process.
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19842
This article states, “The most likely sea route ran north of Hawaii and down America’s Pacific coast.” The Polynesians were master mariners, so anything is possible, but continuing east from Tonga to South America is an extension of the main voyaging area, whereas Hawaii is well off this beaten path. Tom MallardPhoenix, Ariz.
