Scientific American (April 27) — Facebook’s newly formed Building 8 “moon shot” factory is working on a device that would let people type out words via a brain-computer interface. One of the remaining challenges is whether the changes in the returning light will create patterns unique enough to represent each of the letters, words and phrases needed to translate brain waves into words on a screen, says Stephen Boppart, the director of the Center for Optical Molecular Imaging at Illinois.