Laser sniffs out toxic gases from afar

Scientists have developed a way to sniff out tiny amounts of toxic gases—a whiff of nerve gas, for example, or a hint of a chemical spill—from up to one kilometer away.

MIT researchers harness the sun's power

For decades, scientists have been trying to replicate the process of photosynthesis -- the process by which plants convert sunlight into energy. The Economist reports that Angela Belcher and her colleagues at the Massachusetts ...

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