I agree with Zophia. To change humanity completely would be nice, the world is very corrupt.
Actually, there are more good people than bad people. In the past 5000 years, when people make war and attack other countries, The BAD GUY is the king, not the people, so it's only a few 'owerful' sux people up there who 'use' their 'eople' to do 'bad things'.
I would probably put 10 zeros with a 1 in front of them (thats 10 billion if anyones curious) in my checking/savings account. That way I could quit going to school, marry my girlfriend, start my own private security company and not have to worry about anything (these are my real life's goals at the moment)...and help out with like charity and volunteer my time since I'd have some much money.
Have a lot of money will solve many problem, not everything, there are bigger problems when you getting older, and it sux.
Only one? OK. I would want to be much better at writing novels. I could be like that kid with the advice books, except I would have epic novels about a military force governed by Russia, USA, the UK, and Germany.