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Robert Siegel talks with Dr. David Oshinsky about the historic polio vaccination trials. Tuesday is the 100th anniversary of the birth of Jonas Salk, who invented the vaccine.

Three years after Florida A&M student Robert Champion died after a beating on a bus, a member of the university's marching band is on trial for manslaughter.

Melissa Block talks to Campbell Clark, chief political reporter at The Globe and Mail, about developments in Canada since last week's shooting.

Despite being in one of the most dangerous regions in the world, Nicaragua remains relatively peaceful. Analysts credit its style of policing, which has rejected the iron fist policies of neighbors.

The same Atlanta hospital that treated the first U.S. Ebola patient in August discharged its fourth patient Tuesday. All survived. Patients in isolation need extra emotional support, the team says.

Melissa Block talks to Neil Irwin, senior economic correspondent for The New York Times, about the leadership style of Janet Yellen, the chair of the Federal Reserve.

Melissa Block talks to oilman T. Boone Pickens. He told the Wall Street Journal that energy companies are pumping too much oil and that none of them wants to be the first to stop.

Federal Reserve policymakers voted Wednesday to end a giant bond-buying stimulus program that's been in place in one form or another for the last six years.

Mexico's President Enrique Pena Nieto met with relatives of the 43 missing students. For more than six hours, he listened to the families' frustrations over the slow pace of the investigation.

Swift has received accolades and damnation mostly for her image or the messages she supposedly sends, which must be irritating for a musician so clearly devoted to perfecting her techniques.