The mission of the Bill and Melinda Gates Foundation to ease suffering around the world may be somewhat at odds with the "America First" sentiments that propelled Donald Trump into the presidency. But Bill Gates is moving ahead with enthusiasm. He tells Jeffrey Goldberg, The Atlantic's editor in chief, why he's still optimistic, and how he feels about no longer being the richest man in the world. Learn more about your ad choices. Visit megaphone.fm/adchoices