This is completely out-of-character, I know. Still, I was just thinking about this one specific question:
What would I do with a tankerload of cash?
To quantify tankerload, let's say One Billion Dollars.
The question is on one hand very easy to answer, but on the other, you'll find that a lot of things come with strings attached.
I'd like you to carefully consider your replies!
Consider what good you'd do, consider what effects it might have on your environment and the world as a whole, and what actually satisfies your dreams.
Would you support charity, build up a business, or spend everything on self-aggrandizement and gloryhogging?
Would would you support, what create, how'd you put your newfound wealth to use? How'd you treat the money once you got a family going? Would the money go to your children once you drop dead, or would you have different plans for it?
As I said, please consider carefully. I will remove trollish / joke replies! This is supposed to be a somewhat serious discussion, even though that kind of wealth is a pure fantasy to all of us.
However, keep things as realistically achieveable as possible.
Keep in mind that scientific progress is not simply bought like in a video game, but takes time to develop. So I'd wager that your hover boards won't be ready by tomorrow just yet.
Consider the downsides, the effects on your lives, and how governments, taxes and the likes could hinder your efforts. Consider the possibility of making mistakes and going bankrupt as well, if you'd like.