function of people who were climatized. the brain doesn't come back the same. we have somebody 30% higher than mount everest and no climatization and i can't believe his brain wasn't affected. i'm surprised he was conscious. >> again, i find this hard to believe he was actually in that wheel well the entire time. hopefully we'll know more in the next several days. i appreciate your expertise. thank you very much. >> thank you, anderson. coming up the running of the boston marathon. what an incredible day today. incredible moving day for so many. andrea davis crossed the finish line with her brothers who ran in her honor. dozens of militants killed. what u.s. analysts are saying when we come back.