6,899 results
6,899 results for: Bears
- Planetary Science
Red Planet Express: Mars spacecraft traces a watery tale
A Mars-orbiting spacecraft has provided new details about when and where liquid water existed on the planet.
- Earth
Woods to Waters: Wildfires amplify mercury contamination in fish
Forest fires mobilize mercury from the soil and can send the toxic metal into nearby streams and lakes where it accumulates in fish.
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Robo Receptor: Researchers engineer a brain ion channel to take its cues from light
Scientists have engineered an ion channel in nerve cells to open or close in response to light.
- Plants
Cretaceous Corsages? Fossil in amber suggests antiquity of orchids
Orchids appeared on the scene about 80 million years ago, according to evidence from a bee that collected orchid pollen and got trapped in amber.
- 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.
- 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.
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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.
- Archaeology
Lucy’s kind used stone tools to butcher animals
Animal bones found in East Africa show the oldest signs of stone-tool use and meat eating by hominids.
- Life
How salmonella helps kill cancer cells
A bacterial foe gives the immune system a boost to seek and destroy melanoma. The findings may point to a vaccine for melanoma and other malignancies.
- Plants
Chlorophyll gets an ‘f’
New variety of photosynthetic pigment is the first to be discovered in 60 years
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- Space
Mars shows signs of recent activity
The surface of Mars had abundant liquid water as well as volcanic activity during the past 100 million years, a new study of the Martian atmosphere suggests.
