Some patients describe chronic fatigue syndrome as feeling like an "unrelenting flu."
Nearly three decades have passed since the debate began about a series of symptoms that have come to be known as chronic fatigue syndrome. It's cause is still unknown, but over the years, researchers have identified various brain, immune system and energy metabolism irregularities involved. Some patients describe the syndrome as feeling like an "unrelenting, unremitting flu."
Rebel forces in Libya have surrounded the town of Bani Walid, southeast of the capital Tripoli. The rebels are still hoping to negotiate a peaceful takeover of the town, a stronghold of embattled leader Moammar Gadhafi, and avoid further civilian casualties. But Gadhafi loyalists are refusing to surrender.
Since the revolution against the Libyan government began in February, 850,000 people have left the country. That number is expected to rise, given the country's uncertain future. Steve Inskeep speaks to Elizabeth Ferris, a senior fellow at the Brookings Institution, about the effect of the Arab spring on massive migration across North Africa's borders.