❖ Researchers released the first complete wiring diagram of all 139,255 neurons in an adult fly brain — an animal capable of both walking and seeing.

❖ Previous studies have mapped smaller brain systems like fruit fly larva with 3,016 neurons, or the nematode worm with 302 neurons.

❖ Fruit flies have about 140,000 neurons, which is a tiny number compared to the 86 billion in the human brain.