6,899 results
6,899 results for: Bears
- Humans
Letters from the December 17, 2005, issue of Science News
C plus Ewan Cameron, who in 1971 began to collaborate with Linus Pauling on vitamin C and cancer, typically initiated patients with 10 grams per day of vitamin C given intravenously for about 2 weeks, followed by an oral dosage continued indefinitely. The two Mayo Clinic trials referred to in “Vitamin C may treat cancer […]
- Humans
Fossils reveal a strong-armed, dead-end hominid
Olduvai Gorge finds suggest extinct hominid both walked and hung out in trees.
- Life
Neandertal genes point to interbreeding, inbreeding
DNA from 50,000 years ago underscores modest levels of mating across hominid populations.
- Chemistry
Salt spices up chemistry
Hot, compressed sodium chloride stretches the fundamental rules of matter.
- Microbes
Microscopic menagerie
The microbes dwelling in and on multicellular organisms should be viewed as evolutionarily inseparable from their hosts, some biologists argue.
- Anthropology
Skulls from ancient London suggest ritual decapitations
The city’s Roman rulers had special watery places to keep the heads of military enemies or vanquished gladiators.
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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.
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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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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 […]
- Health & Medicine
Do liver stem cells come from bone marrow?
Tests of liver tissue from people who've received liver or blood-marrow transplants show that stem cells in bone marrow can populate the liver as liver cells.
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Predators shape river world top-down
Hunting and no-hunting zones allow a rare test of the much-debated proposal that big carnivores shape their ecosystems from the top down.
- Animals
Flowers, not flirting, make sexes differ
Thanks to lucky circumstances, bird researchers find rare evidence that food, not sex appeal, makes some male and female hummingbirds look different.
