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.
Quote context
[...]
- Try for the heart. They have big hearts, over a hundred pounds.
- An exploding shell in the heart will slow them down, at least.
- Well, the machine won't work more recently than a hundred thousand years ago.
- Why? Well, I... Look, I'm no four-dimensional expert on the subject...
- And there's also some kind of taboo about sending people back to the same time again.
- Eh, it's paradoxes... mustn't have 'em.
- I'm not sure but the university isn't taking chances.
- They've got about a billion years to cover... they won't run out of eras.
- Hallo! Here we go! Now, cheers, eh?
- Well, that's done it. April twenty-fourth, eighty-five million years B.C.
[...]
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Actors: Fred Collins (Announcer), Wendell Holmes, Bill Zuckert, Peter Capell
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