At its October meeting, held at the Stonecipher Astronomy Center, the Door Peninsula Astronomical Society will celebrate the Wisconsin Science Festival with a two-part program: Coggin Heeringa will offer a program describing how glass optical equipment changed the trajectory of science, followed Thomas Minahan demonstrating how lenses work. Free and open to the public. This event is a collaboration between Crossroads at Big Creek, Door County Library and the Door Peninsula Astronomical Society.