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"Science fiction has gotten more accurate as we've gotten closer to the present, because science fiction stories have not only attracted, but also generated current scientists."
- Larry Niven

Protonite  
  Radioactive fuel for spacecraft.  

Early reference to the idea of radioactive fuel for space exploration.

And the fuel was almost gone - word had just come from the rocket rooms that the last chest of radio active protonite had been opened. In a few minutes the great liner would be at the questionable mercy of the Black Hawk.
From Twelve Hours To Live, by Jack Williamson.
Published by Wonder Stories in 1931
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