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Economist Blog: Do you want to be served by some of the biggest grins you've ever seen? Then get thee to Japan, where the Keihin Electric Express Railway Company has come up with a bizarre new customer-service ploy. To ensure they beam at passengers with real gusto, its staff must check their smiles every morning with a piece of computer software called Smile Scan, made by Omron Corp. Workers have their grins scored from 1 to 100, and are given advice on how to improve them. Later in the day they can refer for inspiration to a print-out of their best smile, which they carry around with them.