/members-area/personalblogs/b/blog/posts/coherent-light-saves-the-day-lost-keys-returnedHowdy, Here's yet another reason to join a hackerspace that has a laser cutter - you can etch a QR code to help ensure your lost keys are returned safely: A QR Code That Returns Your Keys Once the code was generated, I etched the acrylic on ...en-USTelligent Community 12