A great writer and certainly an inspiration. He was always curious, interested in science fiction and real science.
He wrote a number of haunting and inspiring stories, such as Farenheit 451. But he also made lots of little contributions...
Have you heard the term "butterfly effect"? It means that slight alterations in initial conditions, in chaotic systems, can result in major changes later on. It's named for the idea that a time traveler doing something as minor as killing a butterfly in the past could have a cascading and unforeseen effect on the future.
That butterfly scenario? It came from a Bradbury short story in 1952.