The second B-21 Raider, the newest stealth bomber from Northrop Grumman, took to the skies at 8 a.m. on September 11. Its flight was accompanied by a vigilant F-16 fighter jet, which stayed close like ...

Scott Detrow talks to Lulu Miller, the host of Radiolab's Terrestrials podcast, about her conversation with the scientist Wanda Diaz-Merced, who studies gravitational waves that ripple through ...