6,913 results
6,913 results for: Bears
- Astronomy
Gamma-ray bursts reveal distant galaxies
A gamma-ray burst recorded Feb. 22, one of the brightest ever detected, is proving to be the strongest evidence so far that these cosmic flashbulbs originate in star-forming regions of distant galaxies and are generated by the explosive death of massive stars.
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When parents let kids go hungry
Researchers comparing Northern and Southern birds have confirmed a prediction about parents protecting themselves at their offsprings' expense.
- Paleontology
Did fibers and filaments become feathers?
A variety of filamentary structures on the fossil of a small theropod dinosaur recently found in China may provide new insight into the evolution of feathers.
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For some birds, Mr. Wrong can be alright
What looks like the ultimate bad choice in romance—a mate from a different species—in some conditions may not be so dumb after all.
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Dolphins may seek selves in mirror images
Dolphins apparently recognize their own reflections.
- Math
Testing for Divisibility
The crisp new dollar bill that I have just taken from my wallet bears the serial number 24598176. It’s easy to tell that the number is exactly divisible by 2 but not by 5. Is it divisible by 3? by 4? by 11? In a 1962 Scientific American article, Martin Gardner noted that during the […]
- Math
Squaring Circles
Cutting a circle into pieces and reassembling the fragments to form a square is a tricky proposition.
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Touring the Poles
Hunting for bear leads to uncountable infinities.
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- Ecosystems
Saving Sturgeon
Sturgeon species around the world are in trouble, which is why humans will increasingly be stepping in to give them a big assist.
- Materials Science
Making the Most of It
A recent crop of studies demonstrates how nature finds strength in unlikely places.
- Animals
That’s One Weird Tooth
The narwhal's distinctive spiral tusk has structures that could make it phenomenally sensitive, raising new questions about its functions.
