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Why does poison ivy make people so itchy?

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The Jeff Koons tulips sculputure outside the Guggenheim Museums in Bilbao, Spain, Basque Country.

What’s the Difference Between Modern and Contemporary Art?

Orange basketball on black background and with low key lighting. Homepage 2010, arts and entertainment, history and society

The 10 Greatest Basketball Players of All Time

Close-up of ostriches (Struthio camelus) necks and heads; location unknown.

6 of the World's Most Dangerous Birds

Entrants falling and tumbling over while chasing the cheese at the 2016 'Cheese Rolling' held at Cooper's Hill, in the Cotswolds, Brockworth England

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Hemp (Cannabis sativa).

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Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland

The Largest Islands in the World

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Why does poison ivy make people so itchy?

Why does poison ivy make people so itchy?

Learn how the oil urushiol, secreted by poison ivy (Toxicodendron radicans),...

Video: © American Chemical Society (A Britannica Publishing Partner)