Excerpt from Princeton Homepage story about eLab Demo Days in NYC and Princeton

Wearing a sharp business suit and a big smile, John Wolfe looked out at the crowd gathered at AppNexus' Manhattan headquarters and asked to borrow someone's credit card.

Silence. Followed by nervous laughter. Finally, someone raised a credit card above their head. Wolfe politely took the card and walked back on stage.

"I promise we won't take too much money," said the 2014 Princeton University graduate in psychology, drawing a laugh from the crowd. Wolfe handed the brave volunteer's plastic to his colleague and classmate Eric Rehe, an economics major, who whipped it through a card reader attached to his laptop. In less than a minute, the two men showed it was possible to create a perfect duplicate of the card — and launched into their pitch for a new business aimed at upgrading credit card security.

Wolfe's team, using the CryptoCard security system developed by fellow Princeton students, was one of seven that presented their ideas at the Keller Center's annual Demo Day last week. This year's presentations marked a first for eLab, Princeton's student business accelerator — in addition to demonstrations on campus Aug. 11, the teams traveled to Manhattan the next day to pitch their ideas before an audience and an expert panel. The teams gathered at the headquarters of the online advertising firm AppNexus, which was founded by Brian O'Kelley, a member of the Class of 1999. 

Continue to the full story on the eLab's Demo Days at princeton.edu.