Steve Jobs is resigning as CEO of Apple. Jobs has engineered Apple's transformation of our relationship with our computers, phones and music. Jobs has been on medical leave from the day-to-day running of the company. The company said that Jobs will be replaced by Tim Cook, Apple's chief operating officer. For more on this story, Melissa Block talks to NPR's Laura Sydell.

Steve Jobs, the mind behind the iPhone, iPad and other devices that turned Apple Inc. into one of the world's most powerful companies, resigned as the company's CEO Wednesday, saying he can no longer handle the job.

The move appears to be the result of an unspecified medical condition for which he took an indefinite leave from his post in January. Apple's chief operating officer, Tim Cook, has been named CEO.

Talking Point Memo's Idea Lab points us to a novel legal argument by Samsung.

The Korean electronics maker is arguing that Apple has no right to its D'889 Patent on its iPad, because Stanley Kubrick showed off the idea in his 1968 film 2001: A Space Odyssey.

Packed into cars and pickup trucks, Libya's rebels honked their horns and fired into the air as they paraded through Tripoli's central square on Wednesday in a show of force and celebration.

Some fighters deliberately targeted the ancient stone walls of the old city that flank the square — apparently because Moammar Gadhafi used the ramparts as a podium while giving speeches. And everyone is now calling it Martyrs Square, rather than Green Square, which was Gadhafi's term.

Even in the relentless heat and dust of the sprawling Dadaab refugee settlement in northern Kenya, camp residents observe the dawn-to-dusk Ramadan fast.

Hawa Abdi is among them. She is from southern Somalia, a part of the country where famine has been declared by the United Nations. She says she has been a refugee at Dadaab for the past six months and is receiving assistance — but still would like more food and other aid.

OK, so your mom was right.

It turns out that moving in with that special someone without getting married first puts you at very high risk for an unplanned pregnancy.

That's one of the key findings of a new report from the Guttmacher Institute.

The report found that overall, "the United States did not make progress toward its goal of reducing unintended pregnancy between 2001 and 2006." In fact, the rate was 49 percent in 2006, virtually unchanged from 48 percent in 2001.

The federal budget problem has gotten a little bit better. That's according to the non-partisan Congressional Budget Office, which released a new report Wednesday. The CBO estimates that this year's deficit will hit about $1.3 trillion. That's a huge amount of red ink — but it's also slightly less red ink than last year.

Back surgery is one of the best documented examples of expensive medical treatments that drive up health care costs while not always helping patients, and sometimes even hurting them.

And the latest Medicare data show that doctors frequently order MRI back scans for patients who haven't tried recommended treatments such as physical therapy. An MRI often prompts surgery.

Scientists say there's a link between climate and violent conflict.

A statistical analysis of civil conflicts between 1950 and 2004 found that in tropical countries, conflicts were twice as likely to occur in El Nino years. The analysis appears in the journal Nature.

El Nino occurs when there is unusually warm water in the Pacific Ocean near the equator. But it affects weather patterns in tropical countries around the globe.

When the film Fort Apache, The Bronx, starring Paul Newman as a conflicted cop patrolling a neighborhood ravaged by poverty and drugs, came out in 1981, it was a controversial hit. Local community leaders fought with the film's producers and threatened to sue because of the way the film depicted blacks and Puerto Ricans.