El Presidente Donald Trump quiere que más compañías petroleras estadounidenses se incorporen a Venezuela. Pero existen razones económicas e históricas que podrían dificultar su acceso.

Federal officials are targeting Democratic-led states over alleged safety-net fraud. Critics worry a drumbeat of unfounded accusations could undermine public trust.

NPR's Short Wave talks about elephants' sniffing abilities, the remarkable migration of painted lady butterflies and a surprising discovery about the early universe.