Ever wish you could tell how people are feeling just by looking at them? Now you can, with this new product from Japanese company Neurowear. The NECOMIMI headband has a sensor on it. The sensor sends brain waves to the band's catlike ears. The ears drop when the wearer is relaxed. They stand straight up when she is concentrating. And when she is both? Then the ears perk up and wiggle wildly. Watch a video to see how they work. (Video clips provided by Neurowear)