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Someday Soon, You May Pay Your Restaurant Bill With A Retina Scan

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Scanning fingerprints

An operator helps an elderly woman scan her fingerprints in May 2012 as she enrolls in an identification project called Aadhar in India. The giant effort, which aims to give every Indian an identity record and number for the first time, involves recording

Credit: Bikas Das/AP

The past 30 years have seen payments shift from cash and checks to debit cards and websites, and most recently to mobile phone apps, including Apple Pay and Venmo. But in a few years, you may not need anything you weren't born with.

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