Great Scott: Officials warn that cheap hoverboards can explode

It’s 2015 and, as Marty McFly’s time traveling adventures predicted, it’s the year hoverboards become a thing. Only the devices we call hoverboards can’t really hover above the ground like the sci-fi skateboard from Back to the Future. Instead, they have Segway-like controls and they’re quite popular with people young and old right now. But these highly-coveted devices, that not many U.S. retailers have in stores this Black Friday season, aren’t necessari