Michael Sandel is a philosophy professor at Harvard who teaches a very popular course called “Justice” that explores material that overlaps with this text. His extensive website Justice with Michael Sandel also has videos of his lectures from that course the first of which focuses on the famous runaway trolley example.
The Trolley Problem: an account of some recent rearch on the problem.
It is impossible to lead a totally ethical life: Ephrat Livni reflects on ethics and everyday life.
Introduction to Philosophy: Ethics, ed. George Matthews. A free textbook, part of a series edited by Christina Hendricks.
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