A roll of duct tape bounced along in my backpack, and a permanent marker poked out of my pants pocket as I strode down the trail. A group of 20 Wisconsin Master Naturalist Volunteers-in-Training ambled behind me. We’d had a challenging morning of botany and geology at Morgan Falls in the Chequamegon-Nicolet National Forest. Lunch had revived us, and now it was time for the afternoon activity. Anticipation bubbled.

“During this activity,” I explained, “you will each become a Professor of something in these woods.”