Princeton professor Cornel West (top) joined Tavis Smiley (center) and Anthony Assadullah Samad during a teach-in about the exhibit “America I Am: The African American Imprint” on view through May 2 at the California Science Center in Exposition park. The event drew an intent crowd and a joint project of Samad’s Urban Issues Breakfast forum and the Smiley Group, which is co-producing America I Am. The interactive exhibit highlights 500 years of African contributions to America through 300 rare artifacts and other items.