Southern Arizona has numerous sites known for their pyroxene minerals, from Twin Buttes south of Tucson, to Ajo, to the Chiricahua, Santa Rita and Patagonia mountain ranges. Pyroxenes are classified ...

Learn what those white specks or crystallized patches on your cheese are, if the cheese is still safe to eat, and how to tell ...

While these sugar plums might not be the ones that danced in the children’s heads in the poem A Visit From St. Nicholas, they’d be welcome at any time of year — not just Christmas. True to their name, ...

Photonic crystals are periodic optical structures that can control the flow of light. Multiple reflections from surfaces separated by a distance similar to the wavelength prevent an optical beam from ...

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In the early 1900s, Wilson A. Bentley sent 500 prints of his snowflakes to the Smithsonian to ensure their safety for the future. The images are now part of the Smithsonian Libraries and Archives.