Ahead of Sunday's 10th anniversary of 9/11, Stephen Colbert interviewed former NBC Nightly News anchor Tom Brokaw on tonight's Report about what he was doing when he learned of the attacks, how he got through the day, and the degree to which the tragedy changed America. You'll find all of Brokaw's responses in this video, but let's just quickly address the first one: he was in the middle of a yoga class.