Scientists rallied for evidence-based public policy outside the American Geophysical Union's fall meeting in San Francisco in December. Marcio Jose Sanchez/AP hide caption

toggle caption
Marcio Jose Sanchez/AP

Should Scientists March? U.S. Researchers Still Debating Pros And Cons

  • Download
  • <iframe src="https://www.npr.org/player/embed/515584634/516787865" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

John Mbugua and his son Giovanni Mbugua, 6, of San Jose, Calif., and Lavon Johnson and his son Mason Johnson, 2, of Fort Meade, Md., greet one another while marching with thousands of other people from Capitol Hill to the Lincoln Memorial on Wednesday. Chip Somodevilla/Getty Images hide caption

toggle caption
Chip Somodevilla/Getty Images

Listen: NPR Special Coverage Of The March On Washington Anniversary

  • Download
  • <iframe src="https://www.npr.org/player/embed/216484456/216546077" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Civil rights leader Martin Luther King waves to supporters from the steps of the Lincoln Memorial on Aug. 28, 1963, in Washington. AFP/Getty Images hide caption

toggle caption
AFP/Getty Images