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http://ed.ted.com/lessons/would-you-sacrifice-one-person-to-save-five-eleanor-nelsen
Imagine you’re watching a runaway trolley barreling down the tracks, straight towards five workers. You happen to be standing next to a switch that will divert the trolley onto a second track. Here’s the problem: that track has a worker on it, too — but just one. What do you do? Do you sacrifice one person to save five? Eleanor Nelsen details the ethical dilemma that is the trolley problem.
Lesson by Eleanor Nelsen, animation by Eoin Duffy.