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Most attempts at a malaria vaccine have unsuccessfully tried to keep the parasite from breaking into red blood cells. But a new twist that keeps the parasite from escaping the cells may work better.

Decades ago, amid fears of rapid population growth, a biologist and an economist made a bet about how many people the planet could sustain. Global population is now estimated to top 7.1 billion. So who won the famous bet?

James Clapper, the director of national intelligence, listed "insider threats," alongside cyber attacks and terrorism. This marks the first time unauthorized disclosures are given such prominence in a threat assessment report.

In The Empire of Necessity, historian Greg Grandin tells the story of a slave revolt at sea. The 1805 event inspired Herman Melville's Benito Cereno, and Grandin's account of the human horror is a work of power and precision.

The virus does not typically spread as far afield as it has in Guinea — and that makes it much harder to stop.

The world is at greater risk than ever from pandemics and biological weapons, health officials said Thursday. In response, the U.S. government is spearheading a global effort to build an early warning system for infectious diseases, drug-resistant microbes and possible bioterror agents.

There's no treatment yet for the deadly viral disease, but several approaches are in the works. At least one experimental drug seems effective in monkeys. Next step: safety tests in people.

Audie Cornish talks to Kevin Bales, a professor of contemporary slavery at the University of Hull and lead author of the 2013 Global Slavery Index. The first-time report by the Walk Free Foundation estimates that there are nearly 30 million people in slavery across the globe.

David Greene talk to UNICEF Emergency Coordinator Bob McCarthy about the situation at a Catholic church in Bossangoa in the Central African Republic. Thousands of people are seeking shelter in the compound of the church. They are fleeing the violence that has engulfed the country after militias overthrew the government earlier this year.

Spain's jobless rate has exceeded even the most dire predictions. As Prime Minister Mariano Rajoy prepares to release a slate of economic changes, Spaniards are hoping he will heed their calls for mercy after years of budget cuts and austerity.