Link roundup — Ruby for iOS, F-stops, LaTeX, WiFi, Sugru, Bulbs

* “Ruby for iOS development”:http://arstechnica.com/business/news/2012/05/exclusive-building-ruby-ios-applications-with-rubymotion.ars. Fascinating stuff. Moving beyond ObjectiveC seems like a good thing. $200 seems a bit steep. * “Simple explanation of F stop”:http://www.petapixel.com/2012/04/02/a-simple-explanation-of-f-stop-numbers/. Useful. But beware, “simple”…