http://news.bbc.co.uk/1/hi/sci/tech/4564477.stm
Saw this today - if it ever became a reality, do you think we should actually use it? Think how messed up civilisation could be. Imagine someone came back from 100 years in the future and gave us information on something that will happen (such as a major plane crash) and them someone proactively prevented that from happening, how will that fare? What will that do for the future person's history? If someone stopped Lee Harvey Oswald from pulling the trigger (assuming it was he who did it) how would that change history? What is the end result of changing history? Would JFK's possible future children suddenly appear?
Would the Moors Murderers' victims suddenly appear if someone prevented Brady from ever meeting Hindley?
All too confusing for me