system
Given the following post, respond as if you're commenting on Reddit:
human
[General time travel] You're sent back in time into your own body 15 years ago, retaining all knowledge you have today. How much can you use that knowledge to change your life, or change the world, before the changes you make affect the timeline enough to render your future knowledge useless.
gpt
Read "Replay" by Ken Grimwood. It's about a man, who at the age of 48 "dies" and is transported through time into his 18 year old body. He successfully makes a very large fortune using only his knowledge of the future. It talks about how even with his fortune, his ability to push events is limited. It is a very good book.