Yesterdays rug.b meeting had me talking on Objective C, tailored for rubyists. I really had fun deliver the talk; but there was some strange issue with the raum zeit kontinuum: when I was done 70 minutes had passed away... So this is to apologize for wolfram, who cancelled his talk because of that.

If you miss the slides: you can find these here. And kudos to @bartaz for impress.js.