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Hang-glider pilots launch themselves over Yosemite Valley during a wildfire, a marine biologist takes a memorable dive through a Channel Island kelp forest and an arborist scales to the very top of a towering redwood.
Highliners walk 400 feet above the floor of Mineral Canyon, a 73-year-old rancher fights to preserve her historic cattle ranch and descendants of an ancient civilization restore the ruins of an irreplaceable American artifact.