Start a game development company. Games are cool. Design challenging games for children. That should help the parents too. Contribute to aeronautics and space exploration. Why it so hard to go to the Moon today when people did it with stick and rope 40 years ago? Contribute to car industry. It's beyond any reason how today's cars are crap from many points of view. Start a foundation. Find better ways to help. Don't stop adding to this list.