ni pbs newshour weekend is made possible by Corporate Funding is provided by mutual of america designing customized individual and Group Retirement products. Thats why we are your retirement company. Additional support is provided by and by the corporation for public broadcasting and by contributions to your pbs station from viewers like you. Thank you. From kqed in San Francisco, hari sreenivasan. Sreenivasan good evening. Thanks for joining us. While definitive answers remain elusive, new information emerged today about the young copilot who authorities believe deliberately flew a Germanwings Airbus into the side of a mountain in the alps. All 150 people on board were killed. For the latest, we are joined by jack ewing of the New York Times. He joins us tonight via skype from montabaur germany where the copilot was from. So what do we know today . Good afternoon. The latest as my colleague in paris has determined, he had sought treatment for vision problems some time before the crash