Bill Whitaker hears from Ray Dalio, one of America’s most successful investors of all time who has pledged to donate half of his $18 billion fortune to charity. This finance icon weighs in on the state of America’s economy and his principle of “radical truthfulness.” Plus, student debt has ballooned into an American crisis, particularly for medical students -- but Lesley Stahl learns about the New York University School of Medicine which recently announced that moving forward it would be tuition-free. And finally, L. Jon Wertheimer explores a lesser known World War II battle in Japan that has defined the remote island of Attu. All this on tonight’s “60 Minutes.”Learn more about your ad choices. Visit megaphone.fm/adchoices