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The 'Green Boots' Identity Confirmed: …
DNA technology has finally confirmed the identity of Everest's 'Green Boots,' a mystery lasting over 20 years. Explore the science of STR and mtDNA analysis in extreme conditions.

Alex Honnold tackles Greenland's Ingmikortilaq—a 4,000-foot unclimbed sea cliff nearly 1,000 feet taller than El Capitan. Full account of team conflicts, deadly rockfall, the headwall summit push, and glacier science findings.