Black slime, otherwise known as biofilm, has been creeping over the National Mall monuments and other iconic areas for a decade

Slimed! Gross 'black slime' creeps over Washington DC's most famous monuments - and no one knows how to get rid of it

By News on the Net --DailyMail——Bio and Archives--August 22, 2016

Abraham Lincoln and Thomas Jefferson have been slimed. A mysterious black slime has been steadily oozing over Washington DC's most famous monuments, including the Lincoln and Jefferson Memorials. Read more...

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