The spring-loaded technology behind the Steadicam has just found another use -- the x-Ar exoskeleton arm, which attaches to your wrists to reduce or eliminate the feeling of weight. Just unveiled at the Applied Ergonomics Conference in Florida this week, the mechanism mounts to a chair or other stable object and loosely cuffs your arms, allowing for a fairly extraordinary range of motion while bearing "the weight of your arm and small objects." (Sledgehammer-wielding workers will probably be better served by
