Raytheon has unveiled its second-generation powered exoskeleton, the XOS 2, coinciding with the release of Iron Man 2 on DVD. The XOS 2 is ligher, faster and uses 50% less power than the XOS 1 proof-of-concept robotic suit. Powered by an internal-combustion engine driving hydraulic actiations, the exoskeleton allows its wearing to lift 200lb repeatedly without tiring, says Raytheon, but is agile enough to climb stairs, kick a ball etc.