Thanks to a mouse watching clips from "The Matrix," scientists have created the largest functional map of a brain to date—a diagram of the wiring connecting 84,000 neurons as they fire off messages.

By mapping the subcellular architecture and protein interactions within cells, researchers can better understand how mutations contribute to pediatric cancers and other conditions.

The stunning research is supercharging our understanding of human brain disorders and advancing U.S. national interests in artificial intelligence.

Scientists have attempted to map the human cell since the first microscope was invented more than 400 years ago. But many ...