On April 29, 1913, a patent was granted to Gideon Sunback for his invention of the “hook-less fastener” to be known as the “zipper.” Gavin, the dog, opens the zipper of his KRNN t-shirt to supervise John, the host, who will pull together a zipper-related song list for the occasion. You are invited to join together in tribute to this zipper 100th anniversary on Crosscurrents, 4/29 at 8 am.