Answer (from Economist): Iris scans used by Citi ATMs

Details: 

THEY are, in the view of Paul Volcker, a former chairman of the Federal Reserve, the only useful financial innovation of recent decades. Better yet, cashpoints (ATMs, to Americans) are still evolving. This week Citibank unveiled one that can identify account-holders by scanning their irises, thus doing away with codes—and with cards, for that matter. Customers request funds via their phones before confirming their identity with a scan.

About the Author

Tim Ranzetta

Tim's saving habits started at seven when a neighbor with a broken hip gave him a dog walking job. Her recovery, which took almost a year, resulted in Tim getting to know the bank tellers quite well (and accumulating a savings account balance of over $300!). His recent entrepreneurial adventures have included driving a shredding truck, analyzing executive compensation packages for Fortune 500 companies and helping families make better college financing decisions. After volunteering in 2010 to create and teach a personal finance program at Eastside College Prep in East Palo Alto, Tim saw firsthand the impact of an engaging and activity-based curriculum, which inspired him to start a new non-profit, Next Gen Personal Finance.