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"The Bully Pulpit" author Doris Kearns Goodwin describes the domestic challenges faced by Presidents Theodore Roosevelt and William Howard Taft.
"What If?" author Randall Munroe chats about the origins of his webcomic "xkcd" and helps Stephen determine the weight of Canada.
John Lithgow chats about his role in "Love Is Strange," a film about an older gay couple who faces discrimination after getting legally married.