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It's a simple enough idea: Know how many calories are in those fast food meals, and you'll make a better choice between them.

But when students at the Columbia University School of Nursing tried to nail down the calories on 70 menus at 12 eateries in New York's Harlem neighborhood, they found it pretty much impossible, even with a calculator.

One big problem: Many items are listed with a calorie range, but with no clues as to how those ranges are determined. For example:

• A bucket of chicken was 2,200 to 5,860 calories.

Melissa Block talks to Zouheir Jabbour, Chief of Mission of the Syrian Embassy in Washington, DC, about the call for a ceasefire in Homs and the allegations of atrocities by the Syrian regime.

A new report by the United Nations' nuclear agency claims that Iran has ramped up production of a purer form of enriched uranium over the past few months. The report by the International Atomic Energy Agency was obtained by The Associated Press and other news outlets and it's likely to further suspicions from Western countries that Iran might be working on a nuclear weapon.

The Obama administration is seeking to try a Lebanese man linked to Hezbollah in a military commission, expanding the reach of the military tribunal beyond al-Qaida and Taliban suspects for the first time.

The man at the center of the case is Ali Musa Daqduq. He was the last detainee held by American forces in Iraq and had been turned over to Iraqi custody when U.S. forces formally withdrew from Iraq in December.

The International Committee of the Red Cross said today that its crews had reached the restive city of Homs in Syria and they have begun evacuating some of those injured by the shelling.

The Telegraph reports that the Red Cross said two wounded Western journalists were were evacuated, as well as the body of two others. The Telegraph adds:

Audie Cornish talks to our regular political commentators — E.J. Dionne of The Washington Post and Brookings Institution, and David Brooks of the New York Times — about the Republican candidate's taxes and next week's primaries in Michigan and Arizona.

A federal appeals court has ruled for the first time that a suspect in a child porn case does not need to unlock his thoroughly-scrambled computer hard drives because it would violate his Fifth Amendment rights. That ruling conflicts with two other cases, including one this week where a Denver-based appeals court says a Romanian immigrant needs to turn over an unencrypted version of her laptop hard drive to help authorities pursue a mortgage fraud case.

The Martin Luther King Jr. memorial isn't the only monument in Washington, DC, that has grappled with how to make a correction. At the Vietnam Veterans Memorial, there are more than 58,000 names inscribed on the wall. More than 100 of them have been misspelled, but 62 have been fixed. Memorial fund president Jan Scruggs explains how they've made the corrections.

We've all seen those bathtub refinishing ads that promise a glossy new surface on the dingy old tub.

But a solvent used to make that transformation has killed at least 13 people who used it to strip bathtubs from 2006 to 2011, according to a new study. The chemical, methylene chloride, is sold as a solvent and paint stripper both to professionals and in dozens of do-it-yourself products sold at home improvement stores.