WELL, THIS IS THE 21ST CENTURY, YOU KNOW: Neuroscientists Wirelessly Control the Brain of a Scampering Lab Mouse. “Implanted in that mouse’s brain was a device about the size of a peppercorn. When we used our wireless power system to switch it on, the device glowed with a blue light that activated genetically engineered brain cells in the premotor cortex, which sends signals to the muscles. We watched in amazement as the mouse stopped its random motions and began to run in neat circles around the cage.”