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Louisiana holds its Republican primary Saturday. All four of the remaining candidates are campaigning in the state.

President Obama spent the past two days traveling the country, touting his all-of-the-above energy strategy. He is promoting solar power and wind power, but says brain power — as in American ingenuity — is also key to curbing the nation's dependence on foreign oil.

Thousands of people gathered Thursday in Sanford, Fla., to rally for justice in the shooting death of an unarmed black teenager, Trayvon Martin.

North Korea's nuclear weapons program is threatening to overshadow the global Nuclear Security Summit in Seoul next week. Last month, North Korea said it would freeze its enriched uranium weapons program and its long-range missile activities in exchange for U.S. food aid. But a few days ago, North Korea announced plans to launch a satellite in April, which the U.S. says is counter to the agreement made last month. Now prospects for the deal are uncertain.

Santorum is the favorite to win Saturday's Louisiana primary based on recent polling. Even with a win, it's hard to see how Santorum will gain much on Mitt Romney's delegate lead, since both are likely to receive some delegates.

Jim Yong Kim is a physician by training and has been a prominent figure on global health issues. He is a former director of the World Health Organization's Department of HIV/AIDS.

Obama will nominate Dartmouth's president to head the World Bank... Friday is the second anniversary of Obama's signing the Affordable Care Act into law... Mitt Romney met Thursday with congressional Republicans to vow he would repeal the health law and say he was running to save the nation.

The AMC series Mad Men — winner of the Best Drama Series Emmy for each of its four seasons to date — returns March 25 after a 17-month hiatus. TV critic David Bianculli determines whether it was worth the wait?

President Obama is nominating Dartmouth College President Jim Yong Kim, to the post of World Bank. For more details, NPR's John Ydstie talks to David Greene.

Biochar has enjoyed a certain revival because it can pull and store the carbon in greenhouse gases from the air. Everyone from California grape growers to home gardeners on YouTube are trying it out.