Well, they know a good deal about that now and there's a safety margin of five hundred years between each trip.
7 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 00:27:26 in the radio play.
Quote context
[...]
- Ghastly mess. Looks as if every bone was pulverized and every blood vessel burst. I dare say.
- But that's his gun all right. It's James... there's no doubt of it.
- You can't have paradoxes, you know... just isn't done.
- And, you see, I'm a lot more careful now.
- I shouldn't have taken James when I knew what a spoiled, unstable sort he was.
- Or Holtzinger, either, when I saw that he was too small to shoot a dinosaur gun.
- With a heavier gun, he'd probably have knocked the tyrannosaur down, and saved his own life.
[...]
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Actors: Fred Collins (Announcer), Wendell Holmes, Bill Zuckert, Peter Capell
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