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If you live in the U.S., you've probably had the experience of paying for a meal using a credit card. The server takes your card, disappears to somewhere in the back, does something with it that you can't see, and returns with your card, along with two paper receipts, one of which you need to sign. Everything that happens to me, I think, what is this, the 1960's?As of last week, the major credit card companies -- American Express, Discover, Mastercard, and Visa -- are no longer requiring that signature. As a Mastercard person told CNET, "It is the right time to eliminate an antiquated practice."

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