The burliest lumberjack with the best-oiled chainsaw couldn"t slice the massive "timbers" found in Petrified Forest National Park in northeastern Arizona. So why are these giant stone logs segmented in such symmetrical rounds, as if they"re ready to be split into firewood?
Petrified Forest National Park
Today in History
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Antarctica Day
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Get the bear facts
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World Space Week
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Stepping stones in Tollymore Forest Park, Northern Ireland
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Happy Cinco de Mayo!
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World Honey Bee Day
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Here comes summer
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Cosplay strongly encouraged
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Fish River Canyon, Namibia
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A splash by the sea
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Happy Thanksgiving!
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Brown-throated three-toed sloth in cecropia tree, Costa Rica
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Fat Bear Week
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A timeless view of the night sky
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Frost on autumn leaves
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World Space Week
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Tesla, the visionary
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Happy International Beaver Day!
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National Frog Month
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Barcelona bids farewell to summer
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World Teachers Day
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Edinburgh Art Festival
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A Bengal tiger in Ranthambore National Park, India
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Baltic Sea, Estonia
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Mapping courage in the Seventh Ward
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World Bicycle Day
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A swim in the sky
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Saskatchewan s spookier side
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Paris is photo-ready this week
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Christmas star lanterns, Germany
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