On Sept. 5, 2019, researchers at the Howard Hughes Medical Instituteﾒs Janelia Research Campus announced that they had unraveled a tangle of more than 1,000 neurons, tracing each cell’s branching route across the brain to pinpoint where it goes and to which cells it connects.

If laid end-to-end, the neurons would stretch more than 85 meters, roughly the length of a soccer field, the team reported in the journal Cell.