One of the biggest crowdpullers at CES (the biggest new tech showcase of the year) was this prototype of a huge robotic exoskeleton. Built by Furrion Robotics, the Prosthesis weighs more than three tonnes. The 4.2m-tall, 4.8m-long mech is operated by a human pilot, just like the AMP suits in the movie Avatar – but its raison d’être is to race other mechs, rather than obliterating blueskinned aliens. Although of course, that will require someone to build another mech for it to race against…