What began with a sliver of brain tissue no larger than a grain of sand has culminated in a scientific achievement once deemed impossible. A global team of researchers has unveiled the most intricate wiring diagram ever created of a mammalian brain.

Thanks to a mouse watching clips from “The Matrix,” scientists have created the largest functional map of a brain to date

They managed to do something that we haven’t done as a neuroscience community in basically all of our history, which is to be able to map the activity of neurons onto the wiring on a very large population of neurons,