Yesterday Google (GOOG) ended its 3-year foray into the radio advertising business. The reason? Google Audio Ads failed to live up to expectations. According to the New York Times it’s the second time in 2 months the company axed a project outside of its online advertising business leading some to speculate that its model may be more limited than people thought. But all is not lost. A Google executive said the company learned many lessons from its failed radio venture and will apply much of the technology to its ongoing interests. About 40 people are expected to be laid off as a consequence but Google said ...