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Sunday's Groupon panel on the Fast Company and PepsiCo stage took an unexpected turn when Travis Kalanick , a longtime Silicon Valley entrepreneur who runs online car service Uber , spoke frankly about his negative experiences as a client of Groupon --and several Groupon staffers in the audience took issue with the story he told.

Nuclear power is evil. Solar power is our savior.

Make room, Pixar and DreamWorks. Industrial Light & Magic, the special-effects shop behind the