Bill Gates’ Plan for Fixing the World
Rather than spread his money over dozens of causes, Gates is focusing on a few specific issues, where he hopes his hands-on approach and vast resources will make a significant difference. In his case, those causes include providing necessary medicine and equipment to help stop the spread of disease, finding vaccines for the likes Malaria and AIDS, and improving education, both in the US and around the world.
via mashable.com
I assume he has looked at stats and all that and picked items that he thinks he can help with. However, coming from a third world country the one thing that I feel might create a better world is more employment opportunities. If someone has a skill that he can earn with, then he can afford to take care of his health. Education is important, but it isn't worth anything if you can't use it. imho.