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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.

Australia's Northern Territory is home to the cunning, powerful and deadly saltwater crocodile — the world's largest. And in the territory's capital, Darwin, the crocodile is both feared and beloved.

Former World Wrestling Entertainment executive Linda McMahon is making her second run for a U.S. Senate seat in Connecticut. Once again she is campaigning with primarily her own millions. And her opponents again say she can't separate herself from the controversial side of professional wrestling.

The Discovery Channel's annual series is one of the longest running events on cable television. After 25 years on the air, it has become an American icon of sorts. "Shark Week" executive producer Brooke Runnette explains how the team keeps the shows exciting year after year.

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.

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.

A decade ago, Botswana was facing a national crisis as AIDS appeared on the verge of decimating the country's adult population. Now, the country provides free, life-saving AIDS drugs to almost all of its citizens who need them.

The ACLU alleges the United States violated the due process rights of Americans killed in drone strikes in Yemen.

Ashley Dias needs lungs. So do lots of other patients. Scarcity is a problem with organ transplants, and, unlike other scarce resources, organs can't be bought or sold. Here's how doctors decide who gets to be at the top of the waiting list.

In Egypt's first presidential debate, only the top two candidates participated. Voters go to the polls later this month to choose among a field of 13 candidates. The winner is expected to be decided in a runoff next month.