Lets say I built a device using some software like NFCProxy or a hardware / software kit like Proxmark3 and just stood in middle of a sidewalk with a high amount of foot traffic and I passively captured all the data of the people walking by me. (law.stackexchange.com)
«I say it to people, and they almost look at me sideways,» he says, «but I would think 10 years from now I'll be walking down Bay Street or Fifth Avenue in New York and in a three block period there'll be two people stopped in the middle of the sidewalk, and they'll be doing one - minute meditation.» (canadianbusiness.com)