“A slime-mold enthusiast told me about a test he had performed. He frequently got lost in IKEA stores and would spend many minutes trying to find the exit. He decided to challenge his slime molds with the same problem and built a maze based on the floor plan of his local IKEA. Sure enough, without any signs or staff to direct them, the slime molds soon found the shortest path to the exit. “You see,” he said with a laugh, “they’re cleverer than me.”