View of Mount Sanford in Wrangell-St. Elias National Park. Wrangell-St. Elias National Park and Preserve is the largest national park in the United States. Here, you can camp on Root Glacier, visit ...

In 2006, while hiking around the Root Glacier in Alaska to set up scientific instruments, researcher Tim Bartholomaus encountered something unexpected. "What the heck is this!" Bartholomaus recalls ...

(Encore episode.) In 2006, while hiking around the Root Glacier in Alaska, glaciologist Tim Bartholomaus encountered something strange and unexpected on the ice — dozens of fuzzy, green moss balls. It ...

In 2006, while hiking around the Root Glacier in Alaska to set up scientific instruments, researcher Tim Bartholomaus encountered something completely unexpected. "What the heck is this!" Bartholomaus ...

Moss balls seem to roll around glaciers in a coordinated way, and researchers can't explain why the whole group moves at about the same speed and... Herd Of Fuzzy Green 'Glacier Mice' Baffles ...