The Wisconsin Department of Natural Resources calls the Waubesa Wetlands "one of the highest quality and most diverse wetlands remaining in southern Wisconsin." This nature preserve, just south of Madison, is the location and subject of the new documentary film "An Invitation to Wonder: Waubesa Wetlands." Wetland scientist and UW-Madison Professor emeritus Calvin "Cal" DeWitt has lived on the edge for the marsh for more than 50 years. In An Invitation to Wonder, filmmaker and DeWitt's grandson Ben Albert brings rich images and striking sounds scapes together with a story of intergenerational discovery On today's edition of A Public Affair, host Douglas Haynes is joined with DeWitt and Albert in the studio. They discuss the wetlands, the wildlife that lives there, and the making of the film. Image from Invitation to Wonder, used with permission