Mount Everest is not the hardest mountain to climb — here’s what makes K2 so much worse

• At least 11 people have died trying to climb Mount Everest this year.
• The second-highest mountain in the world, K2, is even more difficult to climb, according to expert mountaineer Vanessa O’Brien.
• O’Brien is the fastest woman to climb the highest peak on every continent and the first American and British woman to climb K2.
• In the video above, she explains why Mount Everest isn’t the hardest mountain in the world to climb, and why so fewer who attempt K2 ever make it to the top.
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