A couple of years ago, a company called Cortical Labs released a video that showed a simplified version of Pong being played by a culture of human neurons in a Petri dish. The idea that a bunch of neurons in a dish can do anything is impressive enough, but it turns out that things have gotten significantly crazier since then, because the company has now managed to get a similar culture of neurons to play Doom. In a very slick marketing video, the company demonstrates “real neuron gameplay”: Doom running on its CL-1 neural computing system, a microchip upon which...