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According to some older studies, poison ivy and its cousins poison oak and poison sumac cause 10 percent of lost-time injuries among U.S.

Urushiol is what gives poison oak and poison sumac their evil power, too.

He measured and weighed, pressing the leaves of red currant, poison sumac and many other species for his herbarium.

His first mission often had him scoping sidewalks and curbs for smokable cigarette butts - sometimes his skin itchy and eaten up when that night’s woods hideaway dealt him poison sumac.

There is poison ivy, poison sumac and hogweed, and days spent slushing through the rain and mud leaves them vulnerable as well.