While listening to the latest Stephen King novel, 11/22/63. about time travel and lots of other things, I was reminded of the Ray Bradbury story called The Sound of Thunder, as it was cited by one of the characters in King's book. Bradbury's story led to a popular time travel theory dubbed the butterfly effect, which itself is mentioned many times in 11/22/63. Ray Bradbury was a great motivational speaker when it came to young writers and writing. Take a listen to this speech from 2001 about short story writing.