VentureBeat writes, STANFORD, CA: With the highly public failure of its New York taxi beta, it has not been a great week for fancy car service, Uber. To address concerns that the service is not scalable, the company’s CEO and cofounder, Travis Kalanick, made a public appearance to make one thing very clear. He is not worried. ”We know what we’re doing,” Kalanick addressed a roomful of young entrepreneurs at Startup School, Y Combinator‘s annual event at Stanford University. At Saturday’s event, Kalanick spoke immediately after Mark Zuckerberg took the stage. Kalanick has...