Earl Silas Tupper Research and Conference Center, by Guerra, Marcos, 1989, Smithsonian Archives - History Div, A Corotu tree, left, towers near the entrance to the Earl Silas Tupper Research and Conference Center, completed in 1989, at the Smithsonian Tropical Research Institute (STRI), Panama City, Panama. The Center is used by STRI scientists and visiting researchers from around the world..