The Grandfather Paradox
If a time traveler journeys into the past and prevents their own grandparents from meeting, how could the traveler ever be born to make the journey? The paradox…
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A statement that turns back on itself. A conclusion that defies intuition. A puzzle that asks us to look again at what we assumed — unpacked step by step from primary and philosophical sources.
Explore the paradoxes4 published paradox stories — each tracing the question, the hidden assumptions and the proposed resolutions.
If a time traveler journeys into the past and prevents their own grandparents from meeting, how could the traveler ever be born to make the journey? The paradox…
Remove one grain from a heap, then another. The empty table exposes a promise hidden in those small steps—and gives rival theories of vagueness something precise to disagree…
Achilles keeps reaching places the tortoise has left. A clock, a shrinking series and Thomson’s lamp reveal which assumption keeps the faster runner behind.
Plutarch’s ship is repaired plank by plank, then Hobbes gives it a rival made from the old timber. Which vessel inherits the original’s identity?
We want to make each paradox inviting to explore, without skipping the reasoning that makes it interesting.