Amazing short story that I read after I watched the movie Predestination that is based on this story. I recommend both the movie and this story. Amazing concept, original, well written great time travel paradox. Really really great! The movie has more details because it last 97 minutes and the short story is 13 pages but both really deserve your time. I would recommend seeing the movie first, it's not what I usually prefer, but it was in that order that I've seen them and I think it's probably one of the rare time where this is the best option!