I had a fall in the bad weather so I was unavailable
and yes there is a strong possibility that removal of the Persian empire from history would create lasting global peace
its only a theory of course
Another popular one is that to prevent wars you have to prevent the Existance of the concept of nation
I'm pretty sure people have been killing other people from the moment we fell out of the trees and started picking up rocks. Nations and empires are just people getting organized to kill more people. Blaming world wars on the Persians is akin to blaming religious tensions on the Prophet Mohamed. There were wars long before the Persian Empire ever existed. And there will be wars long after.
Conflict is part of the human condition. Some would argue, the most essential part.
Probably go forward far enough for technology to be able to reduce time machine into a module within a suit of powered armour (self-perpetuating supply of course), then go back and tell myself to get a frakkin go kart and start racing
Or stay in the future a while longer, build a working mobile suit, bring it back, go to Diver city and say:
So what would I use time travel for? In combination with personal cloaking/phase shifting technology, I'd use it to go back into the past and observe many events... such as certain assassinations where the identity of the assassins remains a mystery. Or that one murder case way back when five women met their ends at the hands of a killer. Or better yet, I'd observe how the wheel was invented! And I'd write books on what I saw and if possible show evidence that what I've seen actually happen.
I know I'm just the local school bus fanatic, but time travel and the like facinate me.
My personal uses for time travel would be to observe historical events that catch my interest, primarily milestones in the Space Race up to the loss of Columbia in 2003.
Pratical uses, however, I see some lunatic changing the course of history or some wannabe "hero" completely mucking up the time line.
On that note however, I'm also one who believes that for ever possible course of action, a reality with that outcome exists. So the alteration of the time line, in how I believe, would result in the person returning to the altered time line, much like how Back to the Future II and JJ-Trek played out. There exists a point of intersection for the two time lines, but everything beyond that point is altered, thus allowing someone from Timeline A to exist in Timeline B.
But that's two cents worth of a bus's take on temporal mechanics on time travel.