For the northern half of the world it's almost ski season, and thus a curious time to debut a pair of devices that allow skiing in the summertime. Nevertheless Nissan and Japan's National Institute of Advanced Industrial Science and Technology are introducing this pair of two-wheeled, self-balancing devices. Lace up your fresh New Balance kicks, grab onto the handlebars, then hop on to go for a ride. Each one detects weight shifts and motors itself in the direction you want to go -- or at least the direction you're leaning. They don't look particularly stable nor safe, but they could enable some sweet concrete hot doggin' in the summertime -- and some sick splits if you don't have your snowplow perfected.