We've been asking musicians what they think of when they think "American music." Today we hear from Khalif Diouf, aka Le1f.
We also got a video and photos from a listener in response to our story on making shoes with a 3D printer. His 19th century typecasting machine is like a 3D printer, and it still works.
Experts share a range of perspectives on how to combat the Islamic State militant group, and the role the U.S. should play.