Iranian President Hassan Rouhani tells Steve Kroft that his countrymen's chant of "Death to America" is a condemnation of U.S. policy rather than a death wish for Americans; Scott Pelley reports on Pope Francis, who has the last word on his own security and always puts the people he serves ahead of his own safety; Anderson Cooper meets Chaser, a dog who can identify over a thousand toys, and the scientists who are studying the brain of man's best friend.
