Terry Gross

Science writer Dick Teresi and transplant surgeon Richard Freeman discuss the ethics of transplant surgery and how doctors determine the point between life and death.

For five seasons, actress Sonja Sohn played Detective Shakima "Kima" Greggs on the critically acclaimed HBO series The Wire, which chronicled life — and death — on Baltimore's toughest streets. When the series ended, Sohn stayed in Baltimore -- to help young people straighten out their lives.

Historian Andrew Preston says questions in an undergraduate class her was teaching at the start of the 2003 invasion of Iraq spurred the research for his new book, Sword of the Spirit, Shield of Faith. "Once I started looking for religion [in U.S. foreign policy], it was everywhere," he says.