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QR code is an abbreviation for Quick Response Code and is an optically machine-readable label that is attached to an item and that records information related to that item. A QR code consists of black modules (square dots) arranged in a square grid on a white background, which can be read by an imaging device (such as a camera) and processed using Reed-Solomon error correction until the image can be appropriately interpreted; data is then extracted from patterns present in both horizontal and vertical components of the image.
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I'm excited to start using them as a teacher, once I graduate. I like the idea of having some kind of "mobile scavenger hunt" with QR codes posted around my classroom--but I'm being optimistic and imagining myself working in a 1:1 environment. I'm still brainstorming ways to subtly include QR codes into my lesson plans, but I could use some help. If you have any suggestions for me that you've heard of or (better yet) tried yourself, let me know in the comments!