A grimy, black biofilm is starting to cover the Jefferson Memorial, and it can’t be killedIt’s black! It’s creepy! And it’s crawling over the Jefferson Memorial
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I think it's a case of A) They don't know exactly what it is B) They have to be careful not to treat it in a way that damages the marble of the monument
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I don't understand why it can't be killed. If the article explains why that is, I'm not seeing it. Anyone know the explanation?
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A) They don't know exactly what it is
B) They have to be careful not to treat it in a way that damages the marble of the monument
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