Uncategorized
- Paleontology
Ancient DNA suggests polar bears evolved recently
A study of a rare Norwegian fossil narrows down when polar bears evolved and finds they are closely related to modern-day brown bears in Alaska.
- Archaeology
Stone Age engraving traditions appear on ostrich eggshells
Fragments indicate symbolic communication on 60,000-year-old water containers.
- Humans
Titanic study: It takes time to do the right thing
Comparing the Titanic and Lusitania disasters suggests that people in a crisis are more likely to maintain social norms if they have longer to react.
- Health & Medicine
Hormone may be heart-healthy insulin substitute
A study in mice finds leptin lowers blood sugar without raising cholesterol.
- Humans
Facebook users keep it real in online profiles
College students on Facebook display their real personalities, not reinvented selves, a new study suggests.
- Health & Medicine
Germs in tobacco are potential source of respiratory infections blamed on smoking
Tests find hundreds of bacterial species in major cigarette brands.
- Health & Medicine
Chip of tooth tells radiation dose
A two-milligram dot of tooth enamel serves as a radiation dosimeter.
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- Life
Hydrothermal vents sometimes colonized from afar
Deep-sea currents can waft larvae hundreds of kilometers.
- Plants
Losing life’s variety
2010 is the deadline set for reversing declines in biodiversity, but little has been accomplished.
- Health & Medicine
Carotid procedures test about equally
Study finds similar stroke risks after surgery or stents.
- Health & Medicine
U.S. women still have higher stroke incidence than men
Research suggests possible link to abdominal fat.
