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A piece of fatberg from the sewer systems under London's Whitechapel neighborhood on display at the Museum of London. And if you think this piece is gross, you should have seen the fatberg when it was in the sewer.

Lurking in the sewer systems under your feet is a threat so horrifying, so disgusting, that the mere mention of it sends a shiver down the spines of sanitation specialists everywhere. Here’s what you need to know about fatbergs.

Erin McCarthy