The world population is projected to reach nine billion by 2040. An update on global population trends and sustainability.

On a summer day in 1974 New Yorkers looked up to see an acrobat walking on a wire between the tops of the twin towers. In a new novel, Colum McCann imagines what was going on in the lives of the people on the streets below.

Mezzo-soprano Denyce Graves talks about her acclaimed career as an opera singer, and about the challenges she's faced in recent years, including depression, a high-risk pregnancy, and vocal cord surgery.

An update on NATO's role in Afghanistan, tensions over efforts to expand the alliance, and its overall mission in the 21st century

Congress holds hearings to examine how Toyota handled vehicle safety problems. Government watchdog groups raise concerns about ties between lawmakers and the world's largest carmaker. The latest on the Toyota-recall controversy.

Recent sophisticated and large-scale cyberattacks are prompting sharp policy debate on appropriate counterattack strategies: A look at the debate over what steps can be taken to reduce the threat of cyberattacks.

The second in a trilogy of graphic novels about the civil rights movement begins in Nashville in 1960. How young activists confront police brutality and violence in their fight for social change.