Preserving dioramas of African American history

In 1940, at the American Negro Exposition in Chicago (marking the 75th anniversary of Emancipation), evocative dioramas were created to celebrate the often-unacknowledged achievements of African Americans. Today, conservators, including African American students, are restoring these dioramas, bringing their magical artistry, and history, back to life. Correspondent Rita Braver reports.