NASA developed nanosensors to check for fuel leaks and also air quality onboard the International Space Station. In what could be one of the best spinoffs of all time, they are adapting this to piggyback on a smartphone for a wide range of applications on Earth. Soldiers could use these to warn of chemical weapon threats or the presence of explosives. Because exhaled acetone directly corresponds to blood sugar level, diabetics could use this to monitor themselves rather than pricking fingers. Nitrous oxide levels could indicate early, treatable lung cancer.
I hope they are right, and that this is getting out of the lab and into production soon.
P.S. I’m also annoyed that I find this out through Gizmodo and not NASA Public Affairs. Come on, guys.