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U.S. Secretary of State Rex Tillerson said during his visit to South Korea "all options are on the table" when it comes to dealing with North Korea. On Saturday, Tillerson met with Chinese officials.

NPR's David Kestenbaum reports on a possible wrinkle in the space-time continuum. Really. Physicists measuring the fundamental characteristics of a subatomic particle, the muon, have come up with some very puzzling results that could punch a hole in the long-standing "standard model" of how matter is put together. And that could help usher in a completely new theory of matter, time and space. Unless, of course, some scientist has made a mistake. (4:30) (It was later revealed this was a mistake: "Well, I would say I'm responsible for the mistake. My collaborator did most of the work, but I am equally guilty of making mistakes." Toichiro Kinoshita, a physicist at Princeton University. Kinoshita's sin was to have a minus sign where he should have had a plus or maybe the other way around. He can't quite remember, though it ended up having gigantic consequences. Kinoshita and his colleague were calculating how a particular subatomic particle behaves when it's stuck in a magnetic field. The particle, it turns out, wobbles like a toy top at a particular frequency. Kinoshita enlisted hundreds of computers and, after a decade of heroic work, had precisely predicted how fast it should wobble according to the laws of physics. Last winter, other physicists who were out measuring the wobble found it differed significantly from Kinoshita's prediction. In the clockwork world of physics, this was potentially a huge finding, signaling something new and mysterious, except that it wasn't. Kinoshita traced his error to a tiny quirk in a computer program he was using. He hadn't checked that bit, in part because other physicists using a different approach had gotten the same answer."

Thursday could be the committee's final public hearing.

O'Brien has been working in the State Department as the administration's hostage negotiator. He'll replace former Ambassador John Bolton, who parted company with Trump.

Russell Moore criticized Donald Trump and the Southern Baptist Convention's response to a sexual abuse crisis. Then he found himself on the outside.

Ismael Zambada, a historic leader of Mexico’s Sinaloa cartel, and Joaquín Guzmán López, a son of another cartel leader, were arrested by U.S. authorities in Texas, the U.S. Justice Department said.

The Kirkus Prize is one of the most prestigious literary awards in the U.S. This year's winners are Ariel Aberg-Riger, Héctor Tobar and James McBride.

Former Justice Department official Jeffrey Clark was a key figure in a recent Senate report for his promises to pursue former President Donald Trump's false election fraud claims.

Fresh Air's TV critic spends a lot of time watching television — in part because there are so many great shows to watch. Godless, Curb Your Enthusiasm and Fargo are also among his favorites.

Executive vice president and CFO Gustavo Arnal died on Friday. His death came shortly after the home retailer announced layoffs and store closures.