'jOBS' film stars regale Apple faithful at Macworld

Hollywood actors Ashton Kutcher and Josh Gad went before the Apple faithful on Thursday, sharing the terror and elation of portraying the "two Steves" long revered by the cult of the Mac.

Virgin tycoon Branson invests in Square

Square, a start-up from a co-founder of Twitter, said Tuesday that Virgin tycoon Richard Branson has invested in the mobile payments company.

It takes an ecosystem to raise a successful start-up

The geography of entrepreneurship is "spiky", meaning that from region to region there are significant variations in rates of start-ups and, in particular, "scale-ups"—new businesses that are evolving into larger enterprises.

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