When I first began thinking about how to give away my wealth, I did what I always do when I start a new project: I read a lot of books. I read books about great philanthropists and their foundations to inform my decisions about how exactly to give back. And I read books about global health to help me better understand the problems I wanted to solve.One of the best things I read was an 1889 essay by Andrew Carnegie called The Gospel of Wealth. It makes the case that the wealthy have a responsibil...