6,867 results
6,867 results for: Bears
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Ladies First: Genes skew sex ratios in evolutionary struggle
A gene in fruit flies favors the birth of females, until another gene comes along to restore balance between the sexes.
- Earth
Are pollutants shrinking polar bear gonads?
New research links persistent pollutants with reproductive impairment in polar bears.
- 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.
- Archaeology
La Brea del Sur
Excavations at tar pits in Venezuela suggest that the fossils found there may rival those of the famed Rancho La Brea tar pits in Southern California.
- Earth
Grazing on the Periodic Table: Some ancient microorganisms lived on a diet of pure sulfur
Microorganisms that lived 3.5 billion years ago obtained energy by metabolizing pure sulfur.
- Health & Medicine
Fluorine highlights early tumors
Microscopic, fluorine-packed particles can make small, cancerous growths easier to detect.
- Humans
From the October 30, 1937, issue
A photographer captures the coming of winter, motion pictures show how cancer spreads through the blood, and engineers get new oil from old Pennsylvania wells.
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19806
I find it absolutely incredible that anyone is seriously contemplating an escalation of “natural” herbicides as mentioned in this article. As there is no “additive” sprayed on the crop, no testing is likely in animal or human clinical trials. We in the first world must bear the brunt of this wholesale testing on populations, as […]
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19798
Your article shows that meerkats bear an uncanny resemblance to human beings. We, too, have an innate sense of responsibility for our group and individually commit acts of unspeakable violence. John HagerhorstFrederick, Md.
- Humans
Extreme Encyclopedia: Every living thing will get its own page
A consortium of museums and laboratories has unveiled plans to create a free, Web-based Encyclopedia of Life with an entry for every living species.
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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 […]
- Paleontology
Bumpy Bones: Fossil hints that dinosaur had feathery forearms
A series of knobs on the forearm bone of a 1.5-meter-long velociraptor provides the first direct evidence of substantial feathers on a dinosaur of that size.
