Aquatic ecologists Geri and Darby Nelson weave together cultural and natural history as they recount their journey of paddling the entire length of the Minnesota River for the Headwaters Center for Lifelong Learning program October 5. HCLL programs are from 1 to 2:30 p.m. Tuesdays at the Armory Arts & Events Center, 203 Park Ave. So. The sessions are free and handicapped accessible. Refreshments and treats provided.