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19025
Researcher Mark Goodwin’s conclusion that a hollow base to an animal’s horn greatly diminishes its strength, and hence its utility in defense or dueling, begs for an engineering analysis. In tension, compression, and torsion about the axis of symmetry, most of the strength of a cylindrical structure comes from the walls, not the interior. If […]
- Paleontology
How did Triceratops grow its horns?
Newly discovered fossil skulls of juvenile Triceratops may help reveal how the dinosaurs grew their three trademark horns.
- Paleontology
Fossils found under tons of Kitty Litter
Excavations at North America's largest Kitter Litter mine have yielded fossils of ancient aquatic reptiles, as well as evidence of a tsunami generated by the extraterrestrial impact that killed off the dinosaurs about 65 million years ago.
- Health & Medicine
Pregnancy spurs a tumor suppressor
Pregnancy hormones may prime breast cells to maintain a supply of p53, a cancer suppressor protein, thus accounting for why women who have undergone pregnancy generally have a lower breast cancer risk than do others.
- Health & Medicine
Hormone wards off immune cells in womb
A hormone known for its involvement in the brain's response to stress also plays a key role in shielding the developing embryo from its mother's immune system.
- Health & Medicine
AMA: Drugs are for anthrax, not fear
Doctors should not use antibiotics prophylactically against anthrax unless there is good reason to believe the individual had encountered the germs directly, the American Medical Association advises.
- Health & Medicine
Retail meats host drug-resistant bacteria
Three studies appear to tie livestock growth promoters to risk of serious human disease.
- Earth
Lowland tree loss threatens cloud forests
Changes in regional climate brought about by large-scale deforestation in the eastern lowlands of Central America are affecting weather in the mountains downwind, imperiling ecosystems there.
- Paleontology
Lemurs reveal clues to ancient Asian roots
A diminutive lemur species inhabited what is now central Pakistan about 30 million years ago, a new fossil find suggests.
- Chemistry
Nobel recognizes three for handy chemistry
The 2001 Nobel Prize in Chemistry honors research that led to new chemicals, materials, and drugs, including widely used heart medicines.
- Ecosystems
Another World Hides inside Coral Reefs
The first systematic survey of crevices inside Red Sea reefs reveals abundant filter feeders that may capture significant nutrients for the reef.
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From the October 17, 1931, issue
MATERNAL CARES MULTIPLY WITH COMING OF COLD Winter has breathed a hint of its coming already, in puffs of frosty air that make us forget the heat of summer that is gone, even of the unseasonable hot spell of early September. But the coming of the cold bodes only ill for the cold-blooded creatures of […]
