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The crisis between Sudan and South Sudan is heating up, with the north branding its recently-independent southern neighbor "the enemy." This follows two weeks of bitter fighting in the disputed, oil-producing border area between the two Sudans.

Over the weekend, Tupac Shakur made his first appearance on stage since he was shot dead 15 years ago. Shakur was resurrected for a performance with rappers Snoop Dogg and Dr. Dre in the form a realistic looking two dimensional computer image.

House Republicans took the Obama administration to task Monday, this time for a 2010 Las Vegas convention for General Services Administration employees that cost more than $800,000. The convention is the subject of congressional hearings this week.

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President Obama's so-called Buffett rule has slammed into a wall of GOP opposition. On the eve of tax day, Senate Republicans voted yesterday to block a measure that would have made mega-investor Warren Buffett and billionaires and millionaires like him pay at least a 30 percent tax rate. Although Buffett endorses such a rule, Senate Republicans call it an election year gimmick. Their Democratic counterparts insist it's all about fairness. NPR's David Welna has our story.

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The actor Alec Baldwin is in Washington, speaking in favor of the National Endowment for the Arts. The government-funded arts organization long ago supported the Sundance Film Festival and the Vietnam Veterans Memorial. In more recent years, the NEA has supported writers, arts education for kids, and everything from jazz musicians to urban design. It has also faced political controversy; most notably in the 1990s, when its funding was slashed.

The day that many dread is here: It's Tax Day. Of the 143 million federal tax returns filed last year, more than 80 percent qualified for a refund. Steve Inskeep talks to David Wessel, economics editor of The Wall Street Journal, about the economics of tax refunds.

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We're going to hear now from a religious leader revered by Tibetan Buddhists and admired by countless others - the 14th Dalai Lama. A year ago he stepped down as the political leader of Tibet's government in exile to devote himself to spreading a spiritual message of compassion and peace. Still, he's been drawn into talking about violence since a wave of deadly protests swept through the Tibetan areas of China.

Apple share prices dropped more than 4 percent on the NASDAQ Monday — continuing a five-day decline for the maker of iPads and iPhones. In that span, the company's market value has dropped by almost $60 billion. Analysts say this may just be a price correction but warn that it could drag the markets down with it.

In Burlington, Vt., hundreds of people showed up to try to break the record for world's largest cowbell ensemble. The jam band Phish organized the event to raise money for flood relief in Vermont.

The National Rifle Association's annual convention featured a display of shooting targets featuring zombies. Firing ranges across the country are offering zombie-themed shooting events. Sales of zombie targets are booming.

Over the weekend, tornadoes ripped through several states, killing at least five people in Oklahoma and causing millions in damage to communities. Among the hardest hit areas was Wichita, Kan., which has seen its share of hardship over the past several years.

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What the Taliban are calling the start of their spring offensive kept security forces across Afghanistan fighting throughout Sunday and into this morning. Officials say 36 insurgents were killed in Kabul and three other eastern provinces. Three civilians died in the attacks, and eight members of the police and army were killed. American officials are praising Afghan forces, but questions remain about how the insurgents were able to infiltrate the most secure parts of the capital. NPR's Quil Lawrence reports.

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The action by China's central bank widens the range at which the currency can be traded on the international market. The move is seen as seen a step toward addressing foreign complaints that China was suppressing the value of its money to boost Chinese exports, and hurt foreign imports.

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Let's turn now, to the economics of a good meal. Tyler Cowen is an economist, author of the blog Marginal Revolution, and a serious eater. He seeks to use his understanding of economics to zero in on the best food and best restaurants, and he shares what he's learned in a book called "An Economist Gets Lunch." Cowen is a fan of local food. But for the taste, not because he thinks it will save the world.

The Egyptian elections were thrown an unexpected curve when 10 presidential candidates were disqualified from the ballot. They include hopefuls from the Muslim Brotherhood and the old guard.