Uncategorized
- Health & Medicine
Visualizing Cancer: Images of tumors can detect gene expression
Subtle features in X-ray images of tumors let radiologists infer which genes are active in the cancerous growth.
- Animals
Pothole Pals: Ants pave roads for fellow raiders
By throwing their bodies into tiny potholes on rough trails, army ants enable their comrade to race over them, improving the colony's overall foraging success.
- Health & Medicine
Early Start: Fetuses generate immune response to vaccination
A fetus can manufacture immune cells and antibodies in direct response to vaccine given to the mother during pregnancy.
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19839
Rather than concluding that the object that hit Canada 12,900 years ago was a comet, I wonder whether there might not be an alternate reason that geologists haven’t discovered a large hole. If a meteor hit a kilometer-thick glacier, would it have left a crater in the rock underneath the ice? Peter ShorWellesley, Mass. Scientists […]
- Earth
Ice Age Ends Smashingly: Did a comet blow up over eastern Canada?
An extraterrestrial object apparently exploded above Canada about 12,900 years ago, sparking devastating wildfires and triggering a millennium-long cold spell.
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- Humans
Letters from the June 2, 2007, issue of Science News
Where there’s fire Regarding “Risky Flames: Firefighter coronaries spike during blazes” (SN: 3/24/07, p. 180), was the increased death rate due to firefighters having a higher rate of heart disease than people do in other jobs? An analysis of eating habits may reveal more insight. Jim SchmitzSt. Louis, Mo. The study looked only at what […]
- Earth
Using seismometers to monitor glaciers
Seismic instruments could be used to estimate the amount of ice that shears away from glaciers as they flow into the sea, offering a way to better estimate sea level rise due to the breakup of those ice masses.
- Physics
Carbon’s mysterious magnetism
An X-ray experiment has yielded the most conclusive evidence to date that carbon can be magnetic.
- Planetary Science
Powering Enceladus’ plumes
The action of Saturn's gravity is responsible for plumes of water vapor shooting out from cracks on the moon Enceladus.
- Health & Medicine
Stem cells not required
Insulin-producing cells in the pancreas proliferate by cell division, unlike other body tissues, which regenerate from adult stem cells.
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19838
I would debate the “1,000 watts or more” value attributed to typical adults during strenuous exercise as mentioned in this story. Hiking up steep slopes, I rarely exceed 250 W myself, and typical hikers are going much slower. The 1,000-watt figure can only apply to elite athletes during brief periods of peak exertion. David B. […]
