Scientists say the map of a speck of a mouse's brain could be as transformative as the Human Genome Project. Here's what to know.

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.

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,