Nova Sciencenow: What Makes Us Human?

Columnist David Pogue hosts this four-part "Nova scienceNOW" program surveying some of the most current research on the qualities that distinguish humans from all other species on Earth. "Neanderthals 'R' Us" reviews geneticists' findings about ancient specimens; "Stone Age Tech Revolution" connects tools to language skills; scientists try to provoke "Laughter" in our non-human cousins; and "Profile: Zeresenay Alemseged" spotlights an anthropologist's amazing fossil discovery. 60 min. Widescreen (Enhanced); Soundtrack: English Dolby Digital stereo; Subtitles: English (SDH).