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