You may wish to add for those of us who are allergic to video that there's a transcript link top right of the video. (THANK FVCK, because otherwise I would not have bothered with any of the TED stuff I've seen. 20 min? when I can read it in <2min? no chance.)

(eta: and now I've read it & I have a whole bunch of stuff that I would like to say but no time in which to say it right now. I may be back :) )