Invisible River of Gold Is Wave of Wireless Future

Feb. 15 (Bloomberg) -- Spectrum is one of the most important parts of your digital life that you probably know very little about. So, what is it? And why are wireless carriers so obsessed with it? Bloomberg Businessweek's Sam Grobart explains.
What To Watch: Greece, China Stocks, Oil
27:11 - Bloomberg's Jonathan Ferro briefs you on the day's top stories.
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