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Earlier this week, 32-year-old nuclear scientist Mostafa Ahmadi Roshan was killed by a bomb blast on his way to work in Tehran, Iran.

The attack, carried out with a magnetic bomb placed on Roshan's car by a man on a motorcycle, was like something out of a spy novel. In Iran, however, it's very much a reality. Assassins have targeted five Iranian nuclear scientists in the past two years; four of the attacks have succeeded.

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 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.

Private equity firms are under the microscope this week as a pro-Gingrich superPAC hounds GOP candidate Mitt Romney for his role as head of Bain Capital. Weekends on All Things Considered host Guy Raz talks with Dan Primack, senior editor of Fortune Magazine, about how these firms operate and the legitimacy of these attacks.

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SCOTT SIMON, HOST:

This is WEEKEND EDITION from NPR News, I'm Scott Simon. An enormous cruise ship is lying on its side in the Mediterranean today. The Italian ship, Costa Concordia, ran aground off Italy's Tuscan coast, killing at least three people. Passengers described scenes reminiscent of the Titanic. Fabio Costa was working in a shop on the cruise liner when he felt a jolt.

Our panelists answer questions about the week's news: An unlikely Hip Hop battle.

Our panelists tell us three secrets of the Clinton White House, only one of which is true.

Carl reads recent headlines to our panelists, they have to pick which ones are real.

All the news we couldn't fit anywhere else.