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One upon a time, the largest glass telescope mirror was 100 inches in diameter. Today, scientists are casting a mirror 27 feet in diameter that will be part of one of the most powerful telescopes on Earth. NPR's Joe Palca speaks with weekends on All Things Considered host Guy Raz from the mirror laboratory, located under the football stadium at the University of Arizona.

The Citizens United Supreme Court decision has made for a sea change in American politics, but not the change most observers expected. Weekends on All Things Considered host Guy Raz and The Atlantic's James Fallows discuss how corporate money has kept more candidates in the presidential race.

In the past half-century, the fertility rate for a typical Brazilian woman has tumbled from six children to fewer than two. There are several factors at work, and one of them appears to be the glamorous female characters in hugely popular soap operas, who have few, if any, children.

Candidates were explicitly prohibited from even mentioning each other during the presidential forum Saturday. Still, going into the last week of campaigning in South Carolina, most found ways to get in a hit without naming their rivals. Front-runner Mitt Romney was the biggest target.

In this election year, an emerging theme coming from voters around the country is frustration with the tone of politics today. Watching Washington from afar, voters in Jackson County, Ind., are wondering who will look out for rural America.

This week brought a change of scenery for Republican presidential candidates from New Hampshire to South Carolina, where voters will cast ballots on Saturday. Host Rachel Martin talks with NPR's Mara Liasson about the political state of the play in the GOP nominating contest.

More than 150 conservative Christian leaders spent the weekend in Texas meeting about the presidential race and the possibility of coalescing around one Republican candidate. In the end, they rallied for Rick Santorum. Host Rachel Martin talks to Tony Perkins of the Family Research Council about the decision.

It was quite a day for NFL fans Saturday. It started with a close game and ended with a decidedly un-close game. Host Rachel Martin talks with NPR's Mike Pesca about those contests and Sunday's games.

Normally at this time of year, about 50 percent of the U.S. is snow-covered.These days, the figure is now more like 20 percent. It's hurting ski resorts and the local economies that thrive on seasonal winter tourism.

Some people suffering from PTSD have recurring nightmares of a single, traumatic event. Researchers are focusing on a specific event during sleep that may be causing the disturbing dream cycle.