80 years after atomic blast, Hiroshima's trees still tell the story

When Hiroshima became the site of the first-ever use of a nuclear weapon in war, two-thirds of the city was destroyed. Today, it's a lively city of over a million people. And scattered throughout are 159 trees that were nearly destroyed in the blast, but have since grown back to stand as living reminders of an apocalyptic day. Host Marco Werman speaks to National Geographic explorer Paul Salopek about these trees, and how the legacy of the atomic bomb lives on, in the memories of survivors and younger generations of Japanese people.