Now you can read the letter Bill Gates wrote on his progress to save the world. It's the 2013 Annual Letter from Bill Gates.
Once a nerd, always a nerd: Bill talks about the need to measure (and the need for measurements) in his battle to stop polio, improve education, empower gender equality, reduce child mortality, protect the environment and eradicate poverty.
This nerd is spending a lot of money (the money you made for him selling Windows) in a serious way. Read this letter to find out if he is making more progress than Steve Ballmer is these days.
And check out the cool video: Hans Rosling on The River of Myths.