If you were a billionaire what would you do "to change the world?"

[OdinHades]

I would start my own bank, handing out credits to everyone without any interest or other fees at all. I really hate the banks of today, so I would do everything different. Someone can't pay their credit? No problem, I won't sue them or anything. They won't get a new credit until they paid their last one, but that's really all I would do. Even if someone decides to never pay up at all, I'm ok with that.

That's it, nothing more. All my money would just be a safety for the bank (though I will probably trade most of it for Gold or some other stuff more stable than money). Even if that project fails horribly, it should be around for some years with billions of dollars and do some good.