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Astronomers want increasingly large telescopes to peer into the depths of space. To build a solid telescope mirror nearly 30 feet across, you need an oven that heats to 2,100 degrees Fahrenheit and spins around like a top.

Four of the top commissioners of the U.S. Nuclear Regulatory Commission are locked in a feud with the fifth — the chairman, Gregory Jaczko. In a letter to the White House and in a congressional hearing on Wednesday, they called Jaczko a bully who is destroying their ability to do their job.

The legendary R&B group broke onto the music scene in 1991, attracting fans worldwide, winning four Grammys and selling tens of millions of albums. Their latest album is titled Twenty. Guest host Tony Cox speaks with the group about their career, losing a band mate, and whether they'll change their name.

He fills the positions that opened earlier this year when controversies led to Vivian Schiller's departure. Today on Talk of the Nation, and later on Twitter, Knell takes questions.

Ahead of the primary voting in Mississippi and Alabama, guest host Linda Wertheimer talks with William Martin Wiseman, director of the John C. Stennis Institute of Government and Professor of Political Science at Mississippi State University, about the religious politics of the South.

The Army staff sergeant who allegedly killed 16 civilians has been moved to a detention facility in Kuwait. Meanwhile, Defense Secretary Leon Panetta continues his visit to Afghanistan. And the Taliban says it is supspending talks with the U.S.

NPR's Richard Harris talks with host Scott Simon about the Fukushima Dai-ichi reactors, one year after multiple meltdowns there spread radioactive materials across a swath of northern Japan. Huge technical challenges remain and prospects for resettling the area are uncertain.

As anti-China protests continued in Hong Kong, a parade in Beijing showcased stealth fighter jets and new ballistic missiles.

On the anniversary of the People's Republic of China, the country's top diplomat in Washington says it has "no interest in global dominance or hegemony; we just want our people to have a better life."

Saudi Arabia's public prosecutor announced five people have been sentenced to death for the 2018 murder in Turkey of Jamal Khashoggi, a columnist for The Washington Post, after a secret trial.