Search Results for: Butterflies
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1,028 results
1,028 results for: Butterflies
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18938
In grad school, I read and learned from Ernst Mayr’s Populations, Species, and Evolution (1963, 1970, Harvard University Press). I think that “Alarming butterflies and go-getter fish” extremely simplifies Mayr’s position on speciation. The article says that Mayr focuses solely on geographic separation, “allopathic speciation.” This ignores the fact that Mayr discussed a variety of […]
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Evolutionary Upstarts
Theories of the evolution of the human mind are evolving, with some researchers now presenting alternatives to the dominant notion that genetic competition for survival during the Stone Age yielded brains stocked with a bevy of instincts for specific types of thinking.
- Ecosystems
Climate Upsets: Big model predicts many new neighbors
The biggest effects of climate change during the next 50 years may not be extinctions but major reshuffling of the species in local communities.
- Math
A Minimal Winter’s Tale
The organizers of the Breckenridge snow sculpture championships in Colorado must be getting used to having a mathematical element in their annual competition. A simple version of Enneper’s surface just before (above) and just after (below) it self-intersects. The award-winning snow sculpture of Enneper’s surface. For the second year in a row, a team assembled […]
- Animals
When Ants Squeak
In the past 20 years, researchers studying sound communication in ants have discovered a sort of ant-ernet, zinging with messages about lost relatives, great food, free rides for hitchhikers, caterpillars in search of ant partners, and impending doom.
- Ecosystems
Making Scents of Flowers
Science gets the tools to start sniffing around the ecology of floral scent.
- Ecosystems
State of U.S. Agro-ecosystems
About one-quarter of the United States’ land cover, excluding Alaska, is farmed–some 430 million to 500 million acres. A massive new project has just assessed this and other food-producing environments, such as coastal waters, fresh waters, and rangelands, to tally factors contributing to health. Released on Sept. 24, it indicates that most ecosystems are undergoing […]
- Animals
Poison birds copy ‘don’t touch’ feathers
A subspecies of one of New Guinea's poisonous pitohui birds may be mimicking a toxic neighbor, according to a new genetic analysis.
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18973
“Bt corn risk to monarchs is ‘negligible'” is full of manipulative words. How exactly was the “highly polarized atmosphere surrounding genetically modified crops . . . hampering attempts to rationally plan and evaluate research”? The companies that make the strains of corn discussed in the article are not named, of course. Nor are any ties […]
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From the July 25, 1931, issue
98-TON BUTTERFLY VALVE, A SIMPLE DEVICE A good place for a photographer to take a picture, this penstock will be serving an even better purpose when it begins to carry water through the dam to turn the huge turbines of the Ruskin power plant, British Columbia. The flow of water through this 19-foot-diameter intake pipe […]
- Math
Election Selection
By ignoring how voters might rank all the candidates in an election, the plurality system opens the floodgates to unsettling, paradoxical results when there are three or more candidates.
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Biological Dark Matter
The discovery that some genes encode RNA strands instead of proteins has surprised biologists.
