Dale Tarr

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grandfather paradox n. 1939 D. Tarr In Defense of Time Travel in Fantasy Scout (#12) Mar. i. 2/1 I shall attack the well known grandfather paradox, which is: โ€˜If you invented a time machine you could go back and kill your grandpa beforeโ€”beforeโ€”well before it was possible for you to be born later[.]โ€™