Thursday, Aug. 24, 2017

Published: Aug. 24, 2017, 8:52 a.m.

The United States recently noticed something unusual in North Korea\u2019s weapons program: Its missiles started to work. Why? We discuss a surprising discovery. Guest: William J. Broad, who has reported on missile defense for decades. For more information on today\u2019s episode, visit nytimes.com/thedaily.