Edge on Science, which offers summer STEM programs, recently sent a newsletter describing EyeWire.org, a free online gaming environment that facilitates mapping neurons for brain research. The newsletter explained, “[Sebastian Seung’s]  lab at Princeton University has been building 3D models of neurons [and] continuous groups of them. … The computer image processing is not perfect and [with EyeWire] thousands of citizen scientists have contributed to correcting and filling in the connections and completing the 3D models, neuron by neuron.” You can read this description and sign up to play the game.