Take a quarter-mile hike on Patriots’ Path to the archaeological site of Jacob Ford Jr.’s ( gun)powder mill along the Whippany River. Gain insight into the role of the small wooden structure with a dirt/rock lined floor, and of new discoveries made during the latest archaeological dig. Outdoor program. Meet at Acorn Hall’s back porch. No registration required. $7 for non-members ($5 for MCHS members) and $10 to include a tour of Acorn Hall.