What began with a sliver of brain tissue no larger than a grain of sand has culminated in a scientific achievement once ...

Scientists have created the most detailed wiring diagram of a mammalian brain to date, mapping every cell and synapse in a cubic millimeter of a mouse’s visual cortex.

In 1979, biologist Francis Crick claimed it would be impossible to create an accurate diagram of the brain’s wiring and neuronal activity—even within just a cubic millimeter of brain tissue. Now, a ...