It has been a year since a gunman opened fire on Pittsburgh's Tree of Life synagogue, killing 11 people. In an interview with Lesley Stahl, survivors speak out about the deadliest anti-Semitic attack in U.S history. In an interview with John Dickerson, Christine Lagarde, the new head of the European Central Bank, criticizes President Trump's Twitter habits. Plus, Jon Wertheim reports on a classic international detective story, about Christopher Columbus. Those stories on tonight's "60 Minutes."

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