Tianqiao Chen and Chrissy Luo commit an initial $1 billion to brain discovery, treatment, and development. Their gift to Caltech builds on a gift from the Moore Foundation, which established the influential Caltech Brain Imaging Center in 2003. The new donation will attempt to replicate that success by creating four similar centers, each with its own focus, that will form the core of the institute. Reported by Tate Williams.