Dr. Tim Lepore, the island's leading specialist in tick-borne diseases like Lyme disease and babeosis, tells us more about their prevalence here and what can be done to avoid them. At the house, preparations are underway for the installation of the restore Victorian double doors. Inside, Richard Trethewey shows us the new metal ductwork for delivery heating and cooling service for the house; he visits the shop where the metalworking is done. Outside, we get a lesson in sidewall shingling with Eastern white cedar, the preferred siding on Nantucket. Then we visit the Nantucket dump, rapidly reaching its capacity, and see the recycling facility that supervisor Jeff Willet hopes will reduce the flow of material and extend the life of the landfill. Back at the house, Bruce Killen and crew put up the front door roof, install the double doors and see what brackets will look like at the restored entrance.