Science Museums or Centers have become a staple of large and small cities in the western world, both for their educational value and economic development benefits to the host communities. These places vary greatly in size and scope, but have common interests in disseminating often complex scientific concepts to the lay public. In this workshop we will explore the differences between French and American science centers, and discuss the pedagogic and design implications that they entail. The discuss will undoubtedly focus issues related to developmental and educational psychology, and their implications for museum design and operations.