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He's flown the space shuttle five times, and performed eight spacewalks to service the Hubble telescope. Now astronaut and astrophysicist John Grunsfeld heads up NASA's Science Mission Directorate, where he manages scientific investigations on the home planet--and beyond.

Critics say the compensation packages underscore how dangerously out of touch Wall Street was in the years leading up to the financial crisis and Great Recession.

Nonprofit hospitals pay no federal, state, or local taxes. In return, they are expected to offer a community benefit, including free and discounted care for low-income patients. But a study by the Congressional Budget Office found that, on average, not-for-profits are providing only slightly more uncompensated care than for-profit hospitals.

60 harvester ants begin their journey at NPR HQ. And you can watch it live.

The U.S. economy's growth slowed in the first three months of the year. Consumers spent more than expected, but companies invested less in new equipment even though profits were surprisingly strong. Economists say businesses need to grow more to drive the economy forward.

Eighty-one-year-old billionaire investor Warren Buffett reportedly received an early stage prostate cancer diagnosis after a blood test for prostate-specific antigen, or P.S.A. Medical journalist Laura Newman discusses why Buffett's decision to screen and treat his cancer sets a bad precedent.

Michael Morton was convicted of killing his wife and put in prison for life. DNA evidence finally freed him, but it took a quarter-century to force Texas officials to reveal the evidence that exonerated him.

The former Liberian president was convicted of aiding and abetting war crimes in Sierra Leone this week. More than 50,000 people were killed during the 11-year conflict, and in Sierra Leone, the verdict was celebrated. But in Liberia's capital, many believe he has been used as a scapegoat for another country's war.

Actress Michelle Yeoh portrays Myanmar's Aung San Suu Kyi in the new biopic The Lady. Before she played a symbol of nonviolence, Yeoh began her film career as a fighter in martial arts pictures. NPR's Scott Simon talks to Yeoh about the film and her career.

People on all sides of the debate are watching Florida Sen. Marco Rubio attempt to craft a proposal that helps to repair the GOP brand among Hispanics, appeals to independent voters who favor a path to citizenship, and upends President Obama's advantage on the issue without alienating conservatives.