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Blogger Paul Buchheit explains why you need to be flexible. In business, as in life, it's crucial to view an unexpected turn not as an obstacle but as a chance to learn, writes Paul Buchheit ( paulbuchheit.blogspot.com ), co-founder of FriendFeed and the creator of Gmail. Planning in itself is not a bad thing, but picking a single plan and obsessively sticking to it doesn't allow for much serendipity.

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.