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Presented by the Independence Seaport Museum, 211 South Christopher Columbus Blvd. For tickets visit www.phillyseaport.org. As the Independence Seaport Museum prepares to exhibit a 240-year-old artifact — a cheval-defrise from the Revolutionary War fortifications of the Delaware River — learn the story behind this incredible piece of history and meet the conservator working on its preservation. The Science History Institute and The Clay Studio will engage guests in interactive demonstrations to explain how the fate of the artifact was impacted by sitting for hundreds of years in clay and mud, and how the science of conservation