LIKE a research scientist who gets a chance to play with a chemistry set, Sreenath Sreenivasan, a new-media professor at the Columbia Journalism School, returned to the roots of his chosen field last month riding home on the No. 1 train. It was 5:54 p.m. and he was being overwhelmed with messages from people he follows on Twitter saying that Michael Jackson was dead. He gasped at the news, announc
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