What happens to your body when it's exposed to extreme altitudes? How does the lack of oxygen affect the brain? If there were a mountain higher than Everest, would humans be capable of reaching the summit? Find the answers to these questions and much more. Hear the Experts | Mountain Gear: Then & Now | High Exposure: Epilogue Test Your Brain | Higher than Everest? | Climbing without Os How the Body Uses 02 | Pressure on Earth Lost on Everest | High Exposure | Climb | History & Culture | Earth, Wind, & Ice E-mail | Previous Expeditions | Resources | Site Map | Everest Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000