Perovskites can physically reshape themselves in response to light—and then reverse the change instantly. This controllable effect could enable entirely new kinds of light-driven electronics and smart devices. Credit: Marina Leite, UC Davis Researchers at the University of California, Davis have identified a surprising property in a class of materials known as perovskites that could pave the way for a new generation of light-controlled semiconductor devices. Their findings, published March 3 in