A tony social club in midtown Manhattan is not the place one might expect to find a verbal sparring match between famous physicists. But that was the case April 23 at the Harmonie Club, when Alan Guth and David Gross had a feisty off-the-cuff debate about Guth's model for the dawn of the universe. Perhaps in keeping with their genteel surroundings, the two kept their jabs mostly playful, but a few may have stung nonetheless.

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