Hackers could tap into your brainwaves to steal sensitive passwords, warn researchers at the University of Alabama, Birmingham. A new study suggests EEG headsets, the set of electrodes that records brain activity, are hackable. By observing a person's brainwaves as they surf the internet, hackers could glean neural patterns and successfully guess a user's password. Though EEG headsets are mostly used in research, there are now several models on the open market, mostly advertised to video and