In 1921, according to the history books, an newly-blind Englishman named James Biggs was feeling threatened by the amount of traffic in his neighborhood. In order to be more visible to motorists, Biggs reportedly painted his cane white. If true, it means the white cane as an aid to the blind is approaching its 100th birthday. Which explains why, in true Silicon Valley fashion, Raghav Ganesh thought the world was overdue for the white cane, 2.0. "There's an old device here that needed an upgrade," Raghav says, "and I thought I could make that better." Raghav Ganesh, a San Jose...