In this Feb. 1, 2018 photo, Microsoft co-founder Bill Gates, with his wife Melinda, poses for a photo before an interview with The Associated Press in Kirkland, Wash. The Gateses, as the world's top philanthropists, are rethinking their work in America as they confront what they consider their unsatisfactory track record on schools, the country's growing inequity and a president they disagree with more than any other. (AP Photo/Ted S. Warren)
Bill Gates pledged to give away half his fortune to good causes and co-founded The Giving Pledge, a project that encouraged more of the world's wealthiest people to follow suit. Ted S. Warren / AP

Bill Gates thanks UAE for role in the fight to end world poverty