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Crocs shares were up over 5% in early Thursday trading after the offbeat shoe company reported much better then expected revenue and profits for the second quarter, thanks to lower costs and strong sales.

They're so ubiquitous now, a little more than seven years later, that it's hard to remember just how revolutionary the iPod was.Portable music had existed as long as the cassette tape, and compact discs had been in wide use for some 20 years. But those were cumbersome, couldn't be bumped around,...