This week on "Sunday Morning" (May 7)

Construction to begin soon on new $70 million exhibit under the Lincoln MemorialWalgreens employee claims self-defense in shooting of pregnant woman workers say was caught shoplifting

Train carrying hazardous materials derails in MaineOhio governor postpones 3 executions amid struggle to find lethal drug suppliersReport finds democracy for Black Americans is under attack

Bostonians remember deadly marathon bombing 10 years laterRutgers, unions announce agreement, classes to resume

Charlotte murder suspect who was mistakenly released turns himself back into police

For these Boston Marathon bombing survivors, the road to healing meant helping othersMicky Dolenz, the last living Monkee, on keeping the music alive

First Moon Rocks Brought to Earth in 45 Years Hint at Mysterious Volcanic EruptionsTwo Planets Smashed Together So Hard One of Them Lost Its Atmosphere

Astronomers May Have Just Found Evidence of The Very First Stars in Our UniverseStunning Visuals Show Solar Storm Auroras Taking Over The Night Sky