they don't want kids to lesh that it's not all concern learn that it's not all glory. >> yes. if i'm a 15-year-old student and i am from a military family three, four generations and i amex posed to am exposed to a conversation in class about the dangers of the military industrial complex, i probably am going to be the uncomfortable. and i might even say this is un-american, you know, this is terrible. and then teacher's going to say to me, excuse me, this is from a speech by dwight eisenhower. >> right. >> it's part of our history. general eisenhower warned us about this when he was president eisenhower. there isn't much about history that is not going to make somebody uncomfortable. >> that's the point, right? >> and that's how we teach students to step back, ask some questions. yes. columbus, i learned 1492 columbus sailed the ocean blue which certainly helped me learn some may names and dates. [laughter] this is over time historians ask questions because the world around us changes, and this were things we didn't think were important 50 years ago. now we do. but we also se