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Since 1958, researchers have been measuring the amount of carbon dioxide in the atmosphere at the Mauna Loa Observatory. The remote outpost has just reported a carbon dioxide level of 400 parts per million — the highest it has climbed in the modern age.

The Guardian Council, which vets all candidates, approved eight names, but left out an influential former president and a top aide to the current president. Their exclusion gives establishment-friendly candidates a clear path to the presidency in the June 14 election.

Three decades of "The Simpsons." We turn our eye on Springfield with a top writer who has been in the mix since day one.

For many students, Saturday was their first demonstration for a cause. They bundled in the U.S. capital, delivering a defiant message: stricter gun regulation. NPR photographers captured the scene.

The European Union's top diplomat, Federica Mogherini, is expecting a more businesslike, "transactional" approach with President Trump, who's been skeptical of the EU and backs the British exit plan.

Thirteen candidates are up for election. If no candidate tops 40 percent in the vote, the first two finishers advance to a runoff scheduled for April.

Biden's pick to be the Fed's top bank regulator has withdrawn her nomination. She attracted Republican opposition after calling on bank regulators to monitor the financial risks from climate change.

After 19 seasons in the NBA, Carmelo Anthony retires as the 9th top scorer in the league's history, and holds 3 Olympic gold medals.

The 12 nominees for the collection at the Strong Museum of Play in Rochester, N.Y., run the gamut from Breyer horses and Phase 10 to toys with centuries of history, like spinning tops and piñatas.

Five years after the collapse of Enron, the energy trading giant, former employees are hoping to receive some measure of justice on Monday, when former top executive Jeffrey Skilling is sentenced in Houston.