Judging by estimates of potential usage, RFID and printed electronics have a virtually limitless future. If, as it seems, these tags will eventually replace and surpass barcodes, it could mean billions of these tags being produced annually. Already, millions of these tags are in circulation, whether they are ID cards for the Chinese school system, transit cards for Rio de Janeiro, labels on pallets or equipment, or countlessother applications. While there is tremendous potential, the question i...