Uncategorized
- Astronomy
Planetary System in the Making? Stellar eclipse hints at planet-forming debris
Astronomers reported the first evidence that a young star is periodically eclipsed by a stream of debris, possibly an orbiting belt of asteroids held in place by a massive, unseen planet.
- Chemistry
Molecule Sorting: Antibody membrane lends a hand
A new membrane may make it easier to separate mixtures of drug molecules that exist in mirror-image versions into their two components.
- Health & Medicine
Enough Isn’t Enough: An epidemic of vitamin D deficiency
Many U.S. women of childbearing age, particularly those of African descent, lack sufficient vitamin D even though they consume the recommended amount.
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19076
Regarding this article, as planes fly low over the bay to land at San Francisco airport, wing vortices frequently bend down and become twin waterspouts that last up to 20 seconds. Dave GrossmanPalo Alto, Calif.
- Humans
Dangerous Wake: Wing vortices yield a deadly secret
A new mathematical analysis of an aeronautical hazard known as wake turbulence could someday lead to improved air safety and increase the number of flights at major airports.
- Health & Medicine
Let Them Eat Cake: Altered mice stay svelte on a high-fat diet
A protein that links gluttony and weight gain may be a novel target for antiobesity drugs.
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From the June 18, 1932, issue
MUDDY MISSISSIPPI YIELDS PEARLS THAT RIVAL ORIENT’S Pearls we usually picture as coming up from limpid greenish tropical sea depths, in the fingers (or perhaps the mouth) of a swimming brown-skinned native. It seems a bit of a comedown to think of pearls coming out of the prosaic waters of the muddy Mississippi–and as a […]
- Physics
Super Conductors
Materials that conduct electricity without resistance are known as superconductors. Explore the basic physics and potential applications of these fascinating materials at the American Physical Society’s Physics Central Web site. Go to: http://www.physicscentral.com/action/action-01-3.html
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19016
I was intrigued by your article for a couple of reasons. Isn’t this what Steven J. Gould said, that evolution is punctuated by environmental stresses that can bring about adapt-or-die changes rapidly? Also, what are the implications for the geneticists who base their mitochondrial DNA dating techniques on what they consider a fairly constant rate […]
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Evolutionary Shocker?
A specific protein may help plants and animals store genetic variation and release it at times of stress.
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19075
While applauding the work on infant recognition of numbers and arithmetic, it seems prudent that allowance be made for clues in the environment. For example, Arabic numbers themselves contain numbers of end points that can be used to count that many items. I personally used that method in kindergarten when we were made to stop […]
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Numbers in Mind
Initial reports of babies' basic counting abilities have inspired a wave of new research and a spirited debate about what infants really know about numbers.
