Scientists at the University of Tokyo have developed a sheet of adhesive sensors that could be applied directly to the internal workings of moving joints or the surface of a beating heart. The key is an adhesive that is both safe and secure under some very challenging conditions. The adhesive had to be designed to be stable even when the environment is wet and the surface it sticks to is moving. Placing the sensor so close to what it is monitoring means it can provide extremely accurate and precise information. For some applications, like monitoring a heart problem, this means the kind of close monitoring that can ensure timely treatment and save lives. The rest of the device is made of over a hundred tiny sensors supported by thin plastic. The plastic backing is flexible so that, as compared to silicone sensors, this device offers superior comfort and safety.