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What's the best way to find out if an unknown mixture contains a specific substance, like an environmental contaminant? You could use an expensive, bulky gas chromatograph--but Harvard researchers have developed an instrument you can carry in your pocket. They describe the device, called an inverse opal, in the Journal of the American Chemical Society .

Eminem did the trick: Your pitch went well and you signed on your biggest client yet.

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The rise of the tablet computer has me thinking about the future of computers. How many computers surround me right now? I have my office computer, my computer at home, a netbook, my smartphone, my BlueAnt…it seems like computers are everywhere.