Only on the "CBS This Morning" podcast, Grammy Award-winning singer/songwriter Paul Simon and philosopher Peter Singer join CBS News' Adriana Diaz to explain how everybody can make a difference through philanthropy and volunteering. Simon and Singer are marking the 10th anniversary of Singer's book, "The Life You Can Save" with free audio and e-books. The two define effective giving and share the causes that they are passionate about. Simon is one of the many notable voices who narrates one of the chapters of the audio book.