This is why we don't have cold fusion. In the original run of our program it worked. By the year 2030 we were using it to send out starships but detailed data for nearby star systems required too much computer memory. So the programmers changed the laws of physics enough so that cold fusion wouldn't work and restarted us from an old backup from before it was invented.

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Life is like a box of chocolates. All of your choices are bad for you.