NASA Rover Beams Photos of Mars to Earth

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. From 2011 to 2020 he produced stories that explored the minds and motivations of scientists and inventors as part of his series, Joe's Big Idea. Palca is also the founder of NPR Scicommers – A science communication collective.

Liane Hansen has been the host of NPR's award-winning Weekend Edition Sunday for 20 years. She brings to her position an extensive background in broadcast journalism, including work as a radio producer, reporter, and on-air host at both the local and national level. The program has covered such breaking news stories as the wars in Iraq and Afghanistan, the capture of Saddam Hussein, the deaths of Princess Diana and John F. Kennedy, Jr., and the Columbia shuttle tragedy. In 2004, Liane was granted an exclusive interview with former weapons inspector David Kay prior to his report on the search for weapons of mass destruction in Iraq. The show also won the James Beard award for best radio program on food for a report on SPAM.