The Edward W. Kane & Martha J. Wallace Center for Black History opens Friday, June 19, 2026, at the Wanton-Lyman-Hazard House at 17 Broadway, Newport. (Photo by Janine L. Weisman/Rhode Island Current)A cowry shell, a peach pit, and a human tooth. Beads, wooden buttons, nails, glass shards, and broken ceramics. These are items wrapped in blue and white checkered cloth found 21 years ago underneath floorboards in the attic of Newport’s oldest surv…