CMU startup PayTango, dancing as fast as it can

Tired of digging through backpacks and messenger bags for their student IDs and debit cards, four Carnegie Mellon seniors started to investigate ways to consolidate all the cards in their wallets and pay with a swipe of a finger.

They knew they were onto something when, recalls Brian Groudan, “we heard gasps” while demonstrating at a University of Pennsylvania hackathon last fall.