The team concludes that the material “may find widespread applications in wearable smart devices, especially for human motion detection.” To underscore the material’s potential in the wearable-tech realm, the researchers even epoxied the sensor to a rubber glove, and demonstrated its sensitivity to finger motions—which, the authors maintain, is the first report “to the best of our knowledge … of human motion detection using optical sensors.” And they mounted it on the neck of a lab volunteer and managed to tease out a strong signal of the subtler strain associated with breathing, which suggests another application for the material