Brainwave-guided interfaces are common. Most of the time, though, they're not what we'd call subtle. PLX Devices hopes to have that licked through the XWave Sport, a brain interface that disguises all its sensors through a fuzzy, exercise-friendly headband. Underneath the incredibly 1980s-retro (but washable!) look, you'll get about six hours per charge of tracking for concentration, relaxation and other noggin-related data that can
