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Bill Gates allegedly once claimed that if Microsoft made cars, they'd cost $25 and do 1,000mpg. To which Jack Welch, head honcho of US car maker of GM, later retorted that if Microsoft made cars they'd crash twice a day and the airbag would ask if you're sure before deploying. That was then. Today, cars and computing are on a convergence - you could say collision - course. Some cars have up to 150 or more computer chips on board. Renault, to take just one recent example, has chosen Google's Android OS to power its in-car kit.