Coursera founders Andrew Ng and Daphne Koller are computer science professors at Stanford University. Jeff Chiu/AP hide caption

itoggle caption Jeff Chiu/AP

First-grade teacher Euginia Miller reads to her class at Avondale Elementary School in Birmingham, Ala. In this crucible of the civil rights movement, the city's schools are being reintegrated, as a handful of middle-class parents ignore the school district's poor reputation and enroll their kids in the city's public schools. Dan Carsen/WBHM hide caption

itoggle caption Dan Carsen/WBHM

Nona Alberts (Viola Davis) and Jamie Fitzpatrick (Maggie Gyllenhaal) share a triumphant moment with Nona's son Cody (Dante Brown) and Jamie's daughter Malia (Emily Alyn Lind). Kerry Hayes/20th Century Fox hide caption

itoggle caption Kerry Hayes/20th Century Fox

Nov. 18, 2011: Occupy protesters get sprayed at University of California Davis. Thomas K. Fowler/AP hide caption

itoggle caption Thomas K. Fowler/AP