It has something to do with what they call time paradox. You know, if people could go back to recent times, they might do something to affect history or kill their own grandfather, you know.

14 seconds sound clip from the X Minus 1 - A Gun for Dinosaur by L. Sprague de Camp classic radio drama series.

You can hear this line at 00:09:03 in the radio play.

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X Minus One Sound Clip

X Minus OneQuotes with audio samples from the old-time science fiction radio drama series "X Minus One" that was broadcast from 1955 to 1958 on NBC.

Actors: Fred Collins (Announcer), Wendell Holmes, Bill Zuckert, Peter Capell

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