Explosions are insidious. Even if a blast doesn't deliver a conspicuous injury, it can inflict brain trauma that might not be evident until much later. The US Navy's Office of Naval Research doesn't want medics to wait, though. It's developing Blast Load Assessment Sense and Test (conveniently, BLAST), a sensor system that could determine whether or not an explosion's shockwave is likely to have injured your brain. Tiny sensors in your helmet and body armor would record the blast pressure and share it with a scanner. When combined with a palm-sized neurological assessment tool (which stimulates your fingers to gauge your responses), the data would let medical teams quickly decide whether or not you're able to fight.