Dean Kamen showed up on The Colbert Report last night to show off Luke -- the advanced prosthetic arm he's been working on with DARPA and the Defense Department for the past few years. Besides the requisite Segway jokes (and Colbert's are pretty funny, we'll give him that), it's pretty heart-warming to see Kamen and his crazy awesome arm hanging out with our favorite faux Republican. Just more proof that Colbert is a major gadget nerd . The video's after the break -- hit the read link if you want to watch the entire episode.