Pentagon releases what it says are ‘never-before-seen’ files detailing UFOs

<p>CNN's Brianna Keilar and Boris Sanchez speak with astrophysics professor Adam Frank about Friday's Pentagon release of what it says are ‘never-before-seen’ files detailing UFOs. Frank is disappointed with the release; he says this is "more of the same" and because of previous congressional testimony, he was expecting something "harder hitting." </p>