urushiol

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References

Videos

Why does poison ivy make people so itchy?

Why scratching an itch actually makes it worse

Discover

Panama Canal infographic

Timeline and Map of the Panama Canal

Colorful winter sunset

What's the Difference Between a Solstice and an Equinox?

Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics

10 Best Hockey Players of All Time

The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.

What If the President Is Impeached?

Srinivasa Ramanujan, Indian mathematician and autodidact.

6 Interesting Facts about Srinivasa Ramanujan

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

7 of the World’s Most Dangerous Festivals

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

urushiol: Media

oil

Videos

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)

Why scratching an itch actually makes it worse

Why scratching an itch actually makes it worse

Understanding the chemical process of itching and why scratching is futile.

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