Science and technology

Associated Press
BYD employees wait for visitors next to BYD new cars,  at the Beijing International Automotive Exhibition in Beijing, China, Tuesday, April 24, 2012. China's most advanced developer, BYD Co., in which American investor Warren Buffett's Berkshire Hathaway Corp. owns a 10 percent stake, says its electric e6 sedan can travel 300 kilometers (190 miles) on a charge, similar to Western models.  (AP Photo/Alexander F. Yuan)

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