When I first read the news that a rudimentary biological circuit had been created from clusters of kidney cells, I was both excited and amazed (Fussenegger, ETH Zurich). A short time later, I began to imagine the enormous implications of further development. These simple biological AND, OR and NOT switches, comparable to those within an electrical circuit board, would eventually lead to the creation of a fully logical synthetic humanoid brain. One which is capable of conducti