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China's "Tianhe-2" (Milky Way 2) supercomputer took first place in one recent speed test, clocking in at 30 quadrillion calculations per second--about twice as fast as the best American machines. The U.S. still has more supercomputers than any other nation, but some experts say computer speed is a measure of a country's scientific innovation, and worry the U.S. is lagging behind.

NPR's Steve Inskeep asks author Barry Levine about the subpoenas issued by the Republican-led House for depositions from former top officials, including the Clintons, on the investigation into Jeffrey Epstein.

Christopher Krebs, the former top cybersecurity official in the U.S., talked with NPR about how the hack happened and how the U.S. should respond.

After Republicans unexpectedly picked up at least eight seats, House Democrats are still sorting out what went wrong. The party leadership must balance clashing priorities in the next term.

The top target is Pete Buttigieg. He faced a barrage of attacks as the other Democratic candidates seek to blunt his momentum from a strong showing in Iowa.

Philip Reeker, a U.S. diplomat overseeing European affairs, testified he had plans to defend former Ambassador to Ukraine Marie Yovanovitch, but Reeker was overruled by top State Department officials.

The drive to make more milk has had an unsavory side effect: Cows have become more genetically similar and less fertile. Scientists are trying to recover valuable genetic variation that was lost.

Attorney General Bill Barr commissioned U.S. Attorney John Durham to look into the early phases of the Russia investigation. Democrats say he is turning the Justice Department into a political weapon.

Authorities revealed that DNA testing shows the man believed to be the perpetrator of the Christmas Day incident died in the blast.

The investigation into the former CIA director's extramarital affair has now ensnared the top U.S. commander in Afghanistan. Investigators found thousands of communications between Gen. John Allen and a Tampa woman. He says they were not inappropriate. The sordid story is getting confusing.