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When this article says that “scientists don’t expect traditional silicon-based solar cells to become competitive with fossil fuels,” one has to ask, “Ever?” Can anyone accurately predict the future price of polysilicon or of fossil fuels? Peter A. KaczowkaLenox, Mass. Your article notes as a put-down that it would be necessary to build a 1-gigawatt […]
- Tech
Reaching for Rays
Harnessing the sun's rays cheaply and efficiently could address the planet's energy needs.
- Health & Medicine
Dangerous History
The genome of the TB bacterium has small but significant pockets of diversity, giving scientists new targets for preventing and treating the disease.
- Math
Covering New Ground with Polygons
Mathematicians can cover larger areas than they'd realized using polygons with fixed diameters.
