WASHINGTON — American scientists deliberately infected prisoners and patients in a mental hospital in Guatemala with syphilis 60 years ago, a recently unearthed experiment that prompted U.S. officials to apologize Friday and declare outrage over "such reprehensible research."

WASHINGTON – President Barack Obama on Friday said a bittersweet goodbye to the energetic and fierce manager of his White House, chief of staff Rahm Emanuel, and elevated a quiet and seasoned adviser, Pete Rouse, to the most important gate-keeping job in American politics.

PHOENIX (AP) -- Arizona voters will decide in November whether to ban state and local governments from discrimination or preferential treatment based on race, ethnicity and sex.

DES MOINES, Iowa – Arguing doggedly against returning Republicans to power, President Barack Obama told Iowa voters Wednesday that the GOP has been dishonest about what needs to be done to revive the economy and restore middle-class dreams.

LONDON — European security officials said Wednesday a terror plot to wage Mumbai-style shooting sprees in Britain, France and Germany is still active and that sites in Pakistan — where the threat was intercepted two weeks ago — are being scoured for al-Qaida operatives.

ISLAMABAD (AP) — A suspected American missile strike killed four militants in northwest Pakistan on Tuesday, intelligence officials said, the latest in an unprecedented barrage this month against suspected al-Qaida and Taliban targets.

AUSTIN, Texas (AP) — A gunman opened fire Tuesday inside a University of Texas campus library then fatally shot himself, and police are searching for a possible second suspect, university police said.

EAST RUTHERFORD, N.J. (AP) -- Nine-time Grammy winner Mary J. Blige is a big believer in giving chances to aspiring young women.

Six years later, the U.S. Army is unable to document a single payment for prisoner abuse at Abu Ghraib.

LAUSANNE, Switzerland — Nestle will plow some $500 million into expanding its medical nutrition business over the next decade, in a bid to capture a slice of the growing market for foods to treat chronic conditions such as diabetes and obesity, the Swiss consumer company said Monday.