ChatGPT's story about the time machine contains a historical error. Its premise is that the assassination of Abraham Lincoln triggered the American Civil War. This is clearly wrong, since Lincoln was alive and well when the Civil War broke out in April 1861. He was killed four years later, as the war was finishing. Robert E. Lee, the most important Confederate general, had already surrendered... It looks like the sort of mistake a human would make, so I'd be interested to know whether the error was in your prompt, or whether the AI system got this wrong by itself?