Steve Inskeep has the Last Word in business.

Cleanup continues as Exxon Mobile tries to determine the scope of the oil spill in Montana's Yellowstone River. Rising waters due to snow melt could make it difficult for crews to get to some affected areas. Last week, a 12-inch pipeline carrying crude oil burst upstream of a refinery in Billings.

Renee Montagne has business news.

Steve Inskeep talks to Republican strategist Charlie Black, who advised John McCain's presidential campaign, about the foreign policy of the top GOP frontrunners in the 2012 campaign. Strategy in the Middle East, Libya and Afghanistan has already divided the candidates as few other issues have.

Afghan parliamentarians are struggling to hold a unified line against what they see as an unconstitutional push by President Karzai to overturn 25 percent of last September's parliamentary elections. The continuing deadlock has tarnished all sides and exposed the fragility of Afghan democracy.

For more than two years, television and talk radio pundits have been fixated on the Casey Anthony murder trial. The 25-year-old mom was accused of killing her two-year-old daughter and then lying about it for months. On Tuesday, jurors in an Orlando courtroom agreed she is not guilty.

As Pakistan tries to add to its stockpile of nuclear bombs, domestic terrorists are launching more sophisticated attacks on the country's military bases. Together, those trends are raising fears that terrorists might target Pakistan's widening network of nuclear facilities.

The U.S. relationship with Pakistan is fraught with anxiety and danger, and there is no more perilous element than Pakistan's nuclear weapons.

In the summer of 1893, President Grover Cleveland disappeared for four days to have secret surgery on a yacht. It was the beginning of his second term as president and the country was entering a depression, a delicate time in which a president's health was inextricably linked to that of the nation. So Cleveland decided to keep the surgery a secret — and so it stayed for years.

Today, that secret is the subject of Matthew Algeo's new book, The President Is a Sick Man. Algeo tells NPR's Steve Inskeep about the presidential illness that launched a cover-up:

Some nuclear industry officials say if Japan had U.S.-style training for its operators, they might have fared better during the multiple meltdowns at the Fukushima Dai-ichi nuclear power plant. In Japan, workers train on generic simulators. Here, every nuclear power plant has an exact mockup of its control room so plant operators can practice more realistic disaster scenarios.

Take for example the Grand Gulf Nuclear Generating Station, south of Vicksburg, Miss., on the Mississippi River.

A very small number of Americans are now serving in the military — less than 1 percent. Some are looking for direction; others are inspired by a sense of patriotism or by a family member who served in an earlier war. In the series Who Serves, NPR looks at those who have made a decision few others today have — to fight in America's wars.