In our cover story, Conor Knighton looks at how our most popular national parks are dealing with overcrowding. Plus: Ben Tracy explores the rebuilding of a town nearly destroyed by wildfires; Tracy Smith examines the unusual legal strategy used against a gunmaker by the families of Sandy Hook school shooting victims; Seth Doane learns how Australia responded to its worst mass shooting; Luke Burbank finds out how actor Austin Butler became The King in the new movie "Elvis"; Lilia Luciano interviews professor and activist Angela Davis; and Faith Salie checks out the vibrant pop art work of Romero Britto.