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11.21.2007 Leeches!

(running time 5:08)

Mark Siddall, a leech expert at the American Museum of Natural History, wants to change how you think about nature's most notorious blood-suckers. Listen in.

Siddall and deGrasse Tyson

Mark Siddall gave NOVA scienceNOW host Neil deGrasse Tyson a hands-on tour of a leech-infested swamp.

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