Alex Hannold attempts to free solo climb a V10 boulder(03:05)
Casey Anderson witnesses some strange behavior on his search for a polar grizzly bear hybrid.(02:15)
Thirty mountaineers reach Camp 4 on their trek to the summit of K2―the world’s most dangerous mountain.(02:29)
George Kourounis attempts to traverse the potentially deadly crater of fire that may hold the key to life on other planets.(02:00)
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