The Grandfather Paradox
Can time travel create a contradiction in its own past?
The puzzle
The Grandfather Paradox is a compact puzzle that makes ordinary reasoning turn back on itself.
The pressure point
Most paradoxes expose a vague term, a self-reference, or an assumption about infinity, evidence, or time.
A careful response
A useful response does not only give an answer. It explains why the tempting contradiction no longer follows.
Discussion questions
Where does the contradiction enter?
Is the problem in reality, language, or our assumptions?
What rule would dissolve the paradox without ignoring it?