Elon Musk has built the Tesla Gigafactory in the midst of the Nevada desert. But even the deep pockets of the greenminded billionaire could be challenged by the investment needed to create mass-market cars that are electric and driverless, writes Jon Gertner.

A massive storm system stretching from California into Nevada has swollen rivers and caused severe flooding, with hundreds of people evacuated amid the threat of mudslides.

Could McGregor be fighting closer to home from now on?

Donald Trump has emerged the decisive winner of Nevada's Republican caucuses, leaving his main rivals battling for second place in an increasingly urgent effort to slam the brakes on the billionaire businessman's juggernaut.