Extras

    Video thumbnail: PBS NewsHour Why Antarctica has become a major tourist destination

    PBS NewsHour

    Why Antarctica has become a major tourist destination

    How Antarctica's tourist boom could affect Earth's 'last great wilderness'

    Why Antarctica has become a major tourist destination

    Video thumbnail: PBS NewsHour Steve Martin and Martin Short on exploiting mistakes

    PBS NewsHour

    Steve Martin and Martin Short on exploiting mistakes

    Steve Martin and Martin Short on faux flattery and genuine compliments

    Steve Martin and Martin Short on exploiting mistakes