The art students in New York successfully pulled off their Wi-Fi bike stunt, but apparently just barely: They've built access points into bikes and planned to send an email to the mayor from a subway platform. They used two bikes: one above the stairs which used a cell phone network for backhaul and a second below on the subway platform which delivered the signal to a nearby laptop. They apparently just got the network working in time to send an email before the laptop's battery died.