Vending machines that let you pay with your thumbprint

If these thumb-scanning new gizmos catch on, you'll never need to worry about scrounging for "exact change" again

Touch screen vending machines have already debuted in Japan, but thumbprint-reading machines take it up a notch.
(Image credit: Corbis)

While AT&T wants to transform your cell phone into a credit card, one Massachusetts vending-machine company is trying to do the same with your thumb. The prototype vending machines from Next Generation Vending and Food Service eliminate the need for cash and coins by scanning a user's thumbprint and linking it to his credit card. Here's a quick briefing:

Is this really necessary?

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