NOVA scienceNOW: What Are Animals Thinking?

The thinking abilities of animals are examined, including whether dogs really feel guilty when they flash the "guilty look" at their human companions. To that end, David Pogue meets and competes with a variety of animals, upending conventional wisdom about their smarts. Yale scientist Laurie Santos, who's studying a community of rhesus macaques that shares similarities with human society, is also profiled.