As National Park Week continues, we"re turning our attention to the vivid colors of the Grand Prismatic Spring in Yellowstone National Park. Its intense rainbow hues are formed by cycles of hot water rising, cooling, and falling—creating rings of distinct temperatures inside the spring. The clear, blue center is the hottest part, with almost nothing living in it. But the other rings are home to various microorganisms that produce bands of distinct colors ranging from green to orange to red.
Where do those colors come from?
Today in History
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Castle Square, Old Town, Warsaw, Poland
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Venture into a prehistoric gallery of art
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Happy Star Wars Day!
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Saint Dwynwen s Day
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Abraham Lake, Alberta, Canada
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Cecil Brewer Staircase, London
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Honoring our fallen heroes
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Corkscrew Swamp Sanctuary
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Who created the Easter Bunny?
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Ancient town of Sorano, Tuscany, Italy
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Sharp-dressed bug
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Happy Arbor Day!
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Mardi Gras
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Halloween
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The Big Blue of the Sierra
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World Meteorological Day
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Lace up your hiking boots for Mountain Day
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Christmas market at Belvedere Palace in Vienna
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Endangered Species Day
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The Guggenheim Bilbao turns 25
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Up, up, and away for Hot Air Balloon Day
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Arc de Triomphe du Carrousel and the Louvre Pyramid
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A night of art and culture
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Lionfish off the coast of Indonesia
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Womens History Month
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Goðafoss waterfall, Iceland
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Groundhog Day
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International Day of the Tropics
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Iguazu Falls at the border of Argentina and Brazil
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A polar bear near Churchill, Manitoba, Canada
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