People have been trying to turn cellphones into medical and atmospheric scanners for some time now, but when it's NASA stepping up to the plate with a little device to monitor trace amounts of chemicals in the air, it's hard to not start thinking we might finally have a use for all those tricorder ringtones. Developed by a team of researchers at the Ames Research Center led by Jing Li, the device is a small chip that plugs into the bottom of an iPhone and uses 16 nanosensors to detect the concentration of gasses like ammonia, chlorine, and methane. To wh
