Archive: 07/8/2011

Challenge to Groupon's model with trio of deals

(AP) -- Groupon's online coupons save people cash, but they're not always great deals for merchants. Some businesses complain that bargain hunters rarely return after scoring a cheap meal or massage.

dateJul 08, 2011 in Internet
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Unfazed by imperfections

While insulating against electrical currents in their interior, the surface of materials called topological insulators permits the flow of electron spins relatively unhindered. The almost lossless flow ...

dateJul 08, 2011 in General Physics
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