A mirror universe exactly like ours but opposite. [View all]

I just ran across this concept on a Google search. No I don't have a link because it was a comment on a blog that I didn't find very reputable, but I found the concept to be fascinating. I wonder what it would be like? Would it have been a universe where Al Gore had been President? Think of how different things would be today. The Supreme Court would have been different; probably would be at peace and not war; a stable Middle East and so many other possibilities.

So much could be different.