TREE OF LIFE – Lesley Stahl speaks to the survivors of the deadliest anti-Semitic attack in U.S. history a year after a gunman killed 11 people inside their Tree of Life synagogue in Pittsburgh. Shachar Bar-On is the producer. MADAME LAGARDE – Soon-to-be head of the European Central Bank Christine Lagarde talks to John Dickerson about the dangers facing the global economy. Denise Schrier Cetta is the producer. THE COLUMBUS LETTERS – A letter written by Christopher Columbus describing his discovery of the Americas became the world’s first best seller when it was printed and distributed throughout Europe more than 500 years ago. Now the surviving copies are so rare and valuable, they’re being stolen and replaced with forgeries. Jon Wertheim reports. Katherine Davis is the producer.