Questions that break your brain.
If you replace every plank of a ship, is it the same ship? What if you build a new ship from the old planks? Which one is the original?
If advanced civilisations can run simulations of reality, statistically we're more likely to be IN a simulation than not. Are you real?
You travel back in time and give Shakespeare his own plays. He copies them. Where did the plays come from? Neither of you wrote them.
A thought experiment so dangerous that some forums banned discussing it. Google it at your own risk. Or don't. That might be worse.
If the universe is dying, can entropy be reversed? Isaac Asimov wrote the answer in 1956. It's the greatest sci-fi short story ever written.
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