12/22/2016 12:00 AM EST Over the past decade, a dark substance has tarnished the bright white dome of the Jefferson Memorial in Washington, D.C. Despite appearances, it's not just dirt and grime. The mysterious dark substance, a coating of microorganisms called a biofilm, is showing up on monuments and buildings around the globe. In some cases, it has been on these structures for a long time. It's possible that being exposed to the elements has altered the dome of the Jefferson Memorial over the past ...
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Thursday, December 22, 2016
Monumental modeling
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