While attending Parks College of Saint Louis University, I was fortunate enough to be given the opportunity to experience the high altitude chamber in OKC. It's an experience I hope I never forget. I still remember doing simple math problems and mazes while off O2, and thinking I was doing a great job. The the mask came back on, & I saw nothing but scribbles on my paper. If anyone ever gets the chance to experience a high altitude chamber, DO IT!!!!