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cross-section of a petrified dinosaur bone at the Smithsonian National Museum of Natural History in Washington DC

In the gem section of the Smithsonian National Museum of Natural History is this cross-section of a petrified dinosaur bone. It symbolizes for me three great features of this museum:
 - scientific discovery of ancient creatures
 - collection of extraordinory gemstones
 - education about slow geological processes

BIG PHOTO