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.
After a decades long man hunt the defacto head of Mexico's Sinaloa drug cartel is arrested just outside El Paso. What more do we know about his capture and what impact, if any, will this have on the fentanyl crisis here.
The opposition is united against longtime leftist President Nicolas Maduro, who is seeking a third term in this Sunday's election amid the country's gravest economic and political crisis in decades.
Authorities are searching for the arsonists who set fire to high-speed train infrastructure in France, stranding tens of thousands at the start of the Paris Olympics.