It’s one of the most challenging of all human endeavors. The climb to the top of Mount Everest, the highest peak on earth. Two experienced American alpiners, planned to scale Everest without supplemental oxygen. Something only 200 people have successfully done, since the first successful expedition in 1953. They left behind the oxygen, but they took along Snapchat. #EverestNoFilter gave thousands of followers a live, real time look at the adventure. Adrian Ballinger and Cory Richards both returned safely, but with some harrowing stories of what happened near the top of the world.