NASA Gets the Picture About Water on Mars

Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors. Palca is also the founder of NPR Scicommers – A science communication collective.

John Ydstie has covered the economy, Wall Street, and the Federal Reserve at NPR for nearly three decades. Over the years, NPR has also employed Ydstie's reporting skills to cover major stories like the aftermath of Sept. 11, Hurricane Katrina, the Jack Abramoff lobbying scandal, and the implementation of the Affordable Care Act. He was a lead reporter in NPR's coverage of the global financial crisis and the Great Recession, as well as the network's coverage of President Trump's economic policies. Ydstie has also been a guest host on the NPR news programs Morning Edition, All Things Considered, and Weekend Edition. Ydstie stepped back from full-time reporting in late 2018, but plans to continue to contribute to NPR through part-time assignments and work on special projects.