8. Parfit's teleporter
Philosopher Derek Parfit is famous for basing thought experiments on sci-fi. In 1984, he envisioned a teleporter malfunction, like the one that made two James T. Kirks in an episode of Star Trek. Teleporters annihilate every particle in you, then rebuild them from scratch. What happens if the original isn't destroyed? Which is the real you? Parfit says both. Evil Kirk would disagree.
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