Barbara Fried argues that designing theories about this thought experiment dooms them to “marginal significance” in a review of the book On What Matters. A book titled for this thought experiment's “mysteries” collects the 2013 Berkeley Tanner lectures of Frances Kamm. A paper that compares this thought experiment to examples involving the “Health-Pebble” and contrasts doing with merely (10[1])(*) allowing was written by Judith (10[1])Jarvis (10[2])Thomson. This thought experiment was introduced in the paper Abortion and the Doctrine of Double Effect, by Philippa Foot. The central action of this thought experiment, which has a “fat man” variant, is sometimes compared to harvesting organs to save transplant patients. For 10 points, name this thought experiment that asks if it is moral to kill one person to save five from a certain vehicle. ■END■