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I root for sports teams, not companies. But there’s a company that makes me spontaneously erupt with the same incoherent bleats of encouragement that I do when I’m in the presence of the New York Mets: Tesla. Part of it is my preference for underdogs (exhibit A: the Mets). Then there’s Elon Musk (great name for a myth-busting entrepreneur, just like Tom Seaver is a great name for a baseball player) and his crazy idea called the Hyperloop about shooting people through a....