Uncategorized
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Restricting calories keeps immune system young
Drastic limits on calorie consumption starting early in a monkey’s life seemed to delay aging of the animal’s immune systems in new research. Numerous studies have found that calorie restriction can extend the life span of organisms such as yeast, worms, fruit flies, and mice. However, scientists don’t know how caloric restriction lengthens life. Janko […]
- Planetary Science
Signs of recent water on Mars
Pictures showing fresh deposits of bright material on two Martian gullies provide the most compelling evidence yet that water flowed on parts of the Red Planet during the last few years.
- Tech
Shape shifter shifts twice
Certain plastics known as shape-memory polymers switch to predetermined shapes when triggered by heat or light. Now, researchers have developed more-versatile versions of such polymers. When heated, each of the new triple-shape polymers switches to a second shape. Then, at a higher temperature, the plastic changes to a third form. “For some applications, [these] more-complex […]
- Earth
Rocking the House
A recent test that simulated the effect of a magnitude-6.7 earthquake on a full-size, wood-frame townhouse may help engineers and analysts design more earthquake-resistant homes. With sound and video.
- Math
Crafty Geometry
By mastering traditional handicrafts such as knitting and crocheting, mathematicians are better able to understand complex surfaces.
- Computing
What a Flake
New ways to simulate ice-crystal growth yield patterns remarkably similar to the beautiful and intricate shapes of snowflakes and may shed light on how those real-life shapes come about.
- Humans
Letters from the December 23 & 30, 2006, issue of Science News
Playing dead is a lively topic I am amazed that “Why Play Dead?” (SN: 10/28/06, p. 280) concluded that “Scientists have a long way to go to explain why” prey animals play dead. As a veterinarian, I have learned that there are separate centers in the brain dealing with predatory behavior and with hunger. The […]
- Math
Rankings, Tournaments, and Playoffs
All outcome-based sports ranking systems are fundamentally flawed.
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From the December 12, 1936, issue
A rare crystal form, help for bleeders, and seedless fruits without pollination.
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Sounds of the Seasons
A growing interest in acoustic ecology calls attention to the myriad ways in which sounds influence human behavior. Go to: https://www.sciencenews.org/pages/sn_arch/12_21_96/bob2.htm
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19772
This new mathematical method for equitable cake sharing actually leads to a version of Zeno’s paradox. The problem is that the cake remnant left after the referee gives the two eaters their respective, equally valued pieces is no more likely than is the cake as a whole to be homogeneously desirable, thus creating the same […]
- Math
A Fair Slice: New method makes for equitable eating
A new method for cutting cake yields slices that make everyone equally happy.
