Having passwords for you electronic devices is a good idea. But while things like fingerprints, face scans, or retina scans are many times better than, say, “12345,” those too can be vulnerable to hackers. So scientists are working on using your unique brainwaves as a password function. To work, a person is presented with a series of pictures and text to look at, or music to listen to, which their brain interprets as a series as a series of signals, which are the same every time they experience those same bits of information and unique to every person. Scientists hope that some day those signals can used to as a password that can’t be duplicated.