Wal-Mart CEO reveals how the company could eliminate the worst part of shopping

Wal-Mart is testing a revolutionary barcode technology that could eliminate long lines at checkout registers. The technology is called invisible watermarking, and it allows scanners to read barcodes from anywhere on a product's packaging, Mike Rogoway at The Oregonian reports. That drastically speeds up the checkout process because employees don't have to waste time searching for the barcodes on every item they scan. Eventually, the technology could enable shopping carts to read barcodes as item...