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A world worth being curious about.SCIENCE / CULTURE / THE UNEXPECTED
A herd of bison follows a long, winding trail through deep white snow below a tree-lined slope near Tower Junction in Yellowstone.FEATURED
Animals & Nature

How Yellowstone bison use their heads as snowplows

Powerful muscles, layered insulation and warmer feeding grounds help bison endure Yellowstone winters. Finding enough food still takes energy, even for an animal built for the cold.

Read the storyCredit: Jim Peaco / National Park Service · Full credits

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Large reddish-brown petrified log sections lie on a slope overlooking open grassland and a distant mesa beneath a blue sky.
Animals & Nature

How Arizona’s ancient trees became quartz

Burial, mineral-rich water and time preserved ancient wood in stone. The colorful logs also carry signs of the stresses that later broke them apart.

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