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Uber's Chief Executive has resigned after pressure from investors. The $68bn ride-hailing firm has recently been hit by scandals, including sexual harassment allegations. Â鶹Éç's tech reporter in California Dave Lee tells us more about Travis Kalanick, who co-founded the most valuable start-up in Silicon Valley. Photo: Travis Kalanick at an event in Paris in 2013, Credit: Eric Piermont/Getty Images