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Ideas for using QR codes in the classroom, plus some pre made QR code activities (such as a QR code treasure hunt) 

Summary via The Scout Report (Apr 2012): "After watching this erudite (and fun) program from NOVA, you'll never again wonder "Where's selenium?" This two-hour program is hosted by David Pogue (the host of NOVA's "Making Stuff" program) and it "spins viewers through the world of weird, extreme chemistry: the strongest acids, the deadliest poisons, the universe's most abundant elements, and the rarest of the rare." It's a fascinating way to learn about the history of the periodic table, and the discovery and properties of the elements. The site also contains fourteen additional features, such as the Name That Element! quiz, an iPad app, a chemical bonds quiz, an interactive periodic table, and an exploration of the "amazing atomic clock." It may make chemistry junkies out of neophytes, and the already-converted will find much to keep them occupied here. [KMG]"

this is an old post, but I like how it looks at changing questioning style i order to get the most out of our students No more trivial pursuit. No more topical research. No more hunts for simple facts - deadly, tiresome and lacking in value, mind-numbing activities without import. This article offers something like a cider press - but one that easily produces intriguing questions from the mass of curriculum content that usually inspires mere collection or varieties of trivial pursuit.