Zoosh. That may or may not be what an ultrasonic payment sounds like to a dolphin, but it is definitely the name of a new mobile wallet technology developed by Silicon Valley start-up, Naratte. While Google and other major players have focused on traditional radio-based NFC, Naratte has been quietly testing its ultrasound system instead, motivated by the fact that it can work on ordinary handsets without the need for specialized NFC circuitry. Two phones can "zoosh" each other using nothing b
