In Brief

Business news, links and data points from around the web.

Black Friday sales encouraging, but are shoppers done? Google Grows, and Works to Retain Nimble Minds How much energy do shops waste by keeping their doors open in winter? Sony aims for half of Japan’s e-reader market by 2012 Black Friday sales see slight rise J. Crew Agrees to $3 Billion Takeover GOOGLE BUYS GROUPON FOR $2.5 BILLION

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