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.

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GUY RAZ, HOST:

The captain of the Italian cruise ship which ran aground off the coast of Tuscany last night has been arrested on suspicion of involuntary manslaughter. The majority of the ship's 4,000 passengers reached land by lifeboat, but three people are confirmed dead. About 30 are reportedly injured and some 50 are still unaccounted for. It is still unclear what caused the ship to come so close to the rocky shore.

The widening gulf between the rich and everyone else is a growing source of tension in America.

A new survey from the Pew Research Center finds the income gap is now seen as a bigger source conflict in the U.S. than race, age or national origin. That's why some believe the issue could matter in the presidential campaign, and others worry it would warp the national debate.

Two out of three Americans now perceive strong social conflicts over the income gap — up sharply from two years ago. Paul Taylor of the Pew Research Center has an idea what's behind the increase.

As Guatemala's new president, Otto Perez Molina, takes office today, the former general carries the burden of a complicated history into a new struggle against violence.

Haiti has long been regarded as a special challenge for international aid organizations. Scott talks with Laurent Dubois, author of the upcoming book Haiti: The Aftershocks of History, about the effect, or lack thereof, of aid money sent to Haiti in the wake of the earthquake two years ago.

The Muslim Brotherhood has emerged as the big winner in Egypt's parliamentary elections. Long oppressed under the regime of Hosni Mubarak, the Islamist party is now the most important power broker in the country. Lourdes Garcia-Navarro reports that the question on everyone's lips now is what does the Brotherhood really represent and how will it govern?

There is a diversity of views in the Republican field for president that is wide, even wild. Host Scott Simon talks with Ross Douthat, a conservative author and New York Times columnist, about the ideological divides in the Republican Party, as apparent in the GOP presidential race.

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And Mitt Romney spent the last week celebrating a major victory and then fending off some major attacks. NPR's Ari Shapiro reports from Aiken, South Carolina.

ARI SHAPIRO, BYLINE: Mitt Romney had a contradictory week. On the one hand, his landslide win in New Hampshire put him solidly on a course to focus on the general election and President Obama.

MITT ROMNEY: This president puts his faith in government. We put our faith in the American people.

The South Carolina primary is one week from Saturday. On Friday night, former House Speaker Newt Gingrich and former Pennsylvania Sen. Rick Santorum hit an upstate barbecue, vying to emerge as the candidate the state's conservative Republicans can rally behind. NPR's Debbie Elliott was there and has this report.

Karaoke machine manufacturers and the distributors of karaoke CDs have had an uphill battle fighting copyright infringement cases brought by music publishers. One player in the karaoke business is fighting a joint venture of Sony and the estate of Michael Jackson over a $1.28-billion bill. Host Scott Simon has more.