Began at 7:00 PM - Washington Week with Gwen Ifill
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Scientists use time-lapse cameras in the Arctic and Alaska to create an archive of melting glaciers.
NATURE journeys in the footsteps of the men who first explored the park, and travels with their modern-day counterpart on his own journey of discovery. From the unique crystals of individual snowflakes to the grand sweep of Yellowstone's Hayden Valley, this is a Christmas like no other.