In this video excerpt from NOVA scienceNOW, learn about an investigation into empathy and helping behavior in rats. Two rats are placed in a pen: one is trapped inside a see-through tube placed in the center of the cage while the other is free to roam. The free rat tries to find a way open the tube and release the trapped rat, even when given the choice to eat five chocolate chips instead. Correspondent and New York Times technology columnist David Pogue visits neuroscientist Peggy Mason, who explains the details of the experiment and how the findings relate to human empathy.