Elon Musk’s repeated wavering on his deal to buy Twitter has roiled markets and raised fresh questions about his seriousness. His promises to preserve free speech, ban spam bots and dramatically boost revenue may have earned the blessing of the company’s founder, Jack Dorsey, but with Twitter’s…

Ever since Silicon Valley's autonomous cars and mobility apps captured the public imagination, so too has the prospect of an epic battle -- between the forces of high industry and high technology. Nurtured in part by recent history and in part by the part of our brains that loves to watch a good…