The gap between people’s convictions and their justifications is also on display in the favorite new sandbox for moral psychologists, a thought experiment devised by the philosophers Philippa Foot and Judith Jarvis Thomson called the Trolley Problem. On your morning walk, you see a trolley car hurtling down the track, the conductor slumped over the controls. In the path of the trolley are five men working on the track, oblivious to the danger. You are standing at a fork in the track and can pull a lever that will divert the trolley onto a spur, saving the five men. Unfortunately, the trolley would then run over a single worker who is laboring on the spur. Is it permissible to throw the switch, killing one man to save five? Almost everyone says “yes.”