From smartphones to cars and defense missiles, modern U.S. life depends on rare earth elements but China dominates the industry. Lesley Stahl reports; Anderson Cooper has the story of a woman who was arrested and charged with helping her dying father kill himself; Morley Safer profiles a billionaire investor who's pledging a good part of his fortune to save America's history.Learn more about your ad choices. Visit megaphone.fm/adchoices