How would you change the world?

I'd change it so I can change the world in unlimited ways. I would then proceed to play God, molding the world into my sand castle.

1. GOP party would die in a freak Nuclear accident.
   
2. The day would comprise of 38 hours
   
3. Pi would become 3
   
4. I would gain powers akin to Danny Phantom, but no one would know. I would also have the ability to erase memories.
   
5. I'm sure I'd think of more.