Boulder Man Summits Everest Without Supplemental Oxygen

MT. EVEREST, Nepal (CBS4)– A man from Boulder made the trek to the summit of Mt. Everest without supplemental oxygen.
Cory Richards made it to the top and it was all documented on social media by his climbing partner Adrian Ballinger.#Everest Live: 06:34 local time Cory Richards @coryrichardsNG has summited Mt Everest! On his way down now! #EverestNoFilter
— Adrian Ballinger (@alpenglowexp) May 24, 2016Richards achieved his goal overnight Monday and started making his way down on Tue