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19242
There is another interpretation of the mitochondrial DNA data presented in this article. The data make it clear that the more advanced Cro-Magnon males only mated with Cro-Magnon females; however, there is no evidence that the Cro-Magnon females didn’t mate with the more muscular Neandertal males. Jeff Nicoll and Joan Cartier Washington, D.C. Much mixing […]
- Anthropology
Stone Age Genetics: Ancient DNA enters humanity’s heritage
Genetic material extracted from the bones of European Stone Age Homo sapiens, sometimes called Cro-Magnons, bolsters the theory that people evolved independently of Neandertals.
- Humans
Sea burial for Canada’s cod fisheries
The Canadian government has declared an end to cod fishing in nearly all of the country’s Atlantic waters.
- Materials Science
Zeolites get an organic makeover
Scientists can now incorporate organic groups into the framework of zeolites, a kind of inorganic crystal.
- Health & Medicine
Boosting the TB vaccine
A new vaccine for tuberculosis outperforms the current one in tests on animals.
- Chemistry
Drug smugglers leave cellular tracks
Imaging reveals where some experimental nanoscale capsules ferry drugs when they enter cells.
- Astronomy
A black hole that goes the distance
Astronomers have measured the mass of the most distant black hole known.
- Paleontology
Ancient wood points to arctic greenhouse
Chemical analyses of wood that grew in an ancient arctic forest suggest that the air there once was about twice as humid as it is now.
- Health & Medicine
Fecal glow could improve meat safety
Workers who process animal carcasses into meat might soon use a novel type of laser scanner to identify products that have been contaminated with feces.
- Astronomy
Supernovas, gamma-ray bursts: Two of a kind?
Astronomers have uncovered direct evidence that gamma-ray bursts are linked to supernovas.
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19321
Your article was very interesting. While hiking in terrains ranging from midwestern prairies to alpine environments, I’ve seen different forms of buckling due to freezing forces. Though evaporation was given a nod in the article, it too can be a significant force to form patterned ground. In March of 2002, I walked out to the […]
- Earth
Patterns from Nowhere
Scientists are developing geophysical models that may explain the polygonal patterns that appear in and on the ground in remote regions of the Arctic, Antarctica, and possibly the surface of Mars.
