From: BBC News NewsTV5 Bill and Melinda Gates are confident the lives of the world's poorest "will improve faster in the next 15 years than at any other time in history." The ambitious vision... The billionaire philanthropist Bill Gates is using the annual BBC Richard Dimbleby Lecture to spell out his commitment to ridding the world of polio. In 2012, there were just 205 cases of naturally... Bill and Melinda Gates are confident the lives of the world's poorest "will improve faster in the next 15 years than at any other time in history." The ambitious vision is stated in the Bill...Bill and Melinda Gates Major progress ahead for world poorBill and Melinda Gates Major progress ahead for world poor