!['Smithsonian Diversity Super PAC[K] is back.'](http://web.archive.org./web/20151108104151im_/https://scontent.xx.fbcdn.net/hphotos-xpt1/v/t1.0-0/p118x118/12141643_10153576820307488_7405645874810323231_n.jpg?oh=0646435f602f86c29177e6f41542cf1e&oe=56B3C464)
Host and Director of Smithsonian's National Museum of Natural History, Kirk Johnson, explores how the continent was shaped—and how it shaped us.
Experience the colossal geologic forces that shaped our continent over 3 billion years.
video.pbs.org|By PBS
