For the last decade, Oscar-winning documentarian Davis Guggenheim ('An Inconvenient Truth') has turned his cameras on crippling gaps in the U.S. school system. His 2001 films 'Teach' and 'The First Year' took on the desperate need for qualified educators in the Los Angeles area public schools, imploring the next generation to become brighter, stronger teachers for the future.

Almost 10 years later, Guggenheim returned to see what progress had been made. From the looks of things, it wasn't much.

Much buzzed-about at this year's Sundance Film Festival, Guggenheim's 'Waiting for 'Superman'' is a feature-length documentary that asks why the U.S. has fallen to 25th in math and 21st in science among the world's 30 developed countries, yet still -- for whatever reason -- leads the pack in confidence.

The film's new trailer hopes to answer that question.