In this episode of "Angry Planet", we visit the hottest and coldest places in North America. In the last week of July, at the hottest point of the summer, we meet the contestants in the Kiehl's Badwater UltraMarathon, running from the lowest spot in North America through Death Valley up toward to Mount Whitney. Six months later, we head for the Yukon, where an even more extreme ultramarathon is taking place, as the thermometer drops to 50 below zero.

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