Periodic Table of QR codes | Flickr - Photo Sharing! - 1 views
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Sally Norton-Darr on 22 Apr 12"Periodic Table of QR codes A QR code linking to our element videos on YouTube. Please print it out as big as possible and stick it up somewhere... for higher-res go to www.flickr.com/photos/periodicvideos/5912075438/sizes/o/i..."