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.
While excavating the cellar of President Washington's home at Mount Vernon, Va., an archaeologist found two glass jars poking out of the dirt. They hold 250-year-old preserved cherries.
The Panorama Challenge is one of the fiercest trivia competition in New York and requires encyclopedic knowledge of the city. It's where tour guides can shine.