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This month marks the 100th anniversary of the completion of the Roosevelt Dam in Arizona. It was a major part of the Salt River project, which aimed to create hydroelectric power from the Salt River and make its surrounding lands cultivable. The dam was an engineering marvel and was built as part of the Reclamation Act passed in 1902, which sought to irrigate arid lands in the United States--about one-third of the country’s land at the time

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.