Peter Singer's earlier book, The Life You Can Save, kicked off a movement which is continuing to grow. The Most Good You Can Do deals with the results and is here to get the word out about just that, the most good we can do! Peter Singer no longer has to speak to us in ideas, because the movement is here, and it's called "effective altruism". Is doing some good enough when we could be doing more? Is improving a life okay, when we could save one instead? Or saving 3 lives instead of 50? These are the questions which are addressed by Singer's realm of philosophy. The answer is, of course, that which we already know; we should be doing the very most we can, and Singer helps reveal that we can do much more than we may think. Its not so hard to be an effective altruist!