Frustrated Tibetans this week staged some of the largest protests against Chinese rule in nearly four years. Chinese security forces responded by opening fire on demonstrators, killing up to four and wounding more than 30, according to Tibetan rights groups.

The demonstrations were inspired — in part — by a disturbing new trend in Tibetan dissent: Tibetan people lighting themselves on fire.

Transcript

RENEE MONTAGNE, HOST:

The Sundance Film Festival wraps up this weekend in Park City, Utah. Movies and more movies have been on offer at the gathering, famously backed by Robert Redford. Our own Kenneth Turan is taking it all in and joined us from member station KPCW in Park City.

Good morning.

KENNETH TURAN, BYLINE: Morning, Renee.

MONTAGNE: Well, let us begin with the dramatic films. What stands out for you this year?

Renee Montagne talks to Nariman Behravesh, chief economist at IHS Global Insight, about key issues dominating this year's World Economic Forum in Davos, Switzerland. With Europe on the brink of recession, the mood at the meeting is not as upbeat as it was last year.

Transcript

RENEE MONTAGNE, HOST:

The federal government has come out with its new standards for school meals - less fat, less salt, less sugar and more fruits, grains and vegetables. Devin Katayama from member station WFPL reports on how the Louisville, Kentucky school district is trying to comply with the guidelines and satisfy student tastes.

DEVIN KATAYAMA, BYLINE: Meet fourth grade food critic Jackson Schleff.

Renee Montagne has the Last Word in business.

Republican presidential candidates Newt Gingrich, Ron Paul, Mitt Romney and Rick Santorum are scrambling to tie up votes in Florida, which holds its winner-take-all primary next Tuesday. Steve Inskeep talks to conservative writer David Frum about the state of the GOP race.

Cuban-Americans are an important part of the Republican presidential electorate in Florida. Both Mitt Romney and Newt Gingrich have reached out to these voters in Spanish-language TV and radio ads. Romney, in particular, has racked up many endorsements from prominent Cuban-American political figures.

The Obama administration is announcing plans to lease nearly 38 million acres in the central Gulf of Mexico for offshore oil and gas drilling. It's part of the push to boost domestic energy supplies that the president outlined in his State of the Union address. President Obama is also promoting American manufacturing and worker-training efforts this week, as he visits five states likely to be important in the November election.

Newt Gingrich is a self described space nut. He traveled to Florida's Space Coast near Cape Canaveral Wednesday to outline what he described as a bold program that would send Americans back to the moon and beyond.

Gingrich outlined his vision to a crowded hotel ballroom in Cocoa, not far from the Kennedy Space Center. He talked of coming of age at the time of Sputnik, which was the first satellite launched in 1957 by the Soviet Union. He recalled reading science fiction, author Isaac Asimov and Missiles and Rockets magazine.

The world's largest mirrors for the world's largest telescopes are made under the football stadium at the University of Arizona.

Why there? Why not?

"We wanted some space, and it was just used for parking some cars, and this seemed like a good use," says Roger Angel.

Angel is the master of making big mirrors for telescopes. For 30 years he has been using a method called spin casting to make the largest solid telescope mirrors in the world.