Maricopa County Sheriff Paul Penzone reacts to the guilty verdict of criminal contempt of court trial of his predecessor, former Sheriff Joe Arpaio.
Discover personal stories of what it means to be American, told from the points of view of unlikely activists who bridge cultural, economic and political divides.
Delve into U.S. history and the "American Experience" on Tuesdays at 8 p.m.
This winter, "Nova" explores bird brains, the dinosaurs' demise and other secrets of the universe. Join us each Wednesday at 8 p.m.