It's been 100 years since the end of Prohibition. We look back at the 13-year-ban on alcohol and how it shaped American drinking culture with William Rorabaugh, author of "Prohibition: A Concise History." Also, Arizona Public Service, the state's largest utility company, recently announced plans to be carbon free by 2050. Host Peter O'Dowd speaks with APS CEO Jeff Guldner about how the company plans to reach its goals.