Civil War, 1896 Tsunami, Mau Mau, Yuri Gagarin, Bay of Pigs

In the last week alone we've had at least three big anniversaries: 150th anniversary of the start of the (American) Civil War; 50th anniversary of the first human being into space; 50th anniversary of the Bay of Pigs. So we'll look back at each of those moments. Plus Lisa Mullins interviews an archivist at National Geographic about an American writer and photographer, Eliza Scidmore, who documented the aftermath of a tsunami in northeast Japan more than a century ago. And we have two segments on the history behind the trial unfolding in London right now over alleged British atrocities in Kenya during the counterinsurgency campaign against Mau Mau rebels in the 1950's.