Facebook users shared a photo and story in March 2025, claiming bears formed an "unprecedented blockade" at an entrance to ...

Giant viruses dating back 1.5 billion years were found in ... many of the archaea as thermophiles, which means they thrive in hot, acidic conditions like the ones found in the park.

Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park. Find more at natgeo ...