Human traffic jams at 29,000 feet: Why so many people are dying on top of Mount Everest

Mount Everest is big, dangerous — and, more and more, crowded.

In fact, the world's tallest mountain is getting so crowded with climbers, spring 2019 is shaping up to be one of the mountain's deadliest climbing seasons in years.

Here's why so many people are dying on Mount Everest.

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