CHICAGO - Scientists for the first time have grown human heart valves using stem cells from the fluid that cushions babies in the womb - offering a revolutionary approach that may be used to repair defective hearts in the future.
WASHINGTON - A big drop in gas prices pushed consumer costs down for a second straight month, and factories staged a modest rebound - signs the Federal Reserve is managing to stem inflation without pushing the country into recession.
HANOI, Vietnam - Visiting a land where America suffered military defeat, President Bush urged patience for positive results in Iraq on Friday and tried to stiffen global resolve to challenge a nuclear-armed North Korea.
BAGHDAD, Iraq - British ground forces and U.S. military helicopters fought with gunmen Friday in southern Iraq where four American security contractors and their Austrian co-worker were abducted in a convoy hijacking near the Kuwait border.
WASHINGTON - Cast into the minority by an angry electorate, House Republicans chose Rep. John Boehner of Ohio on Friday to lead a return to power as quickly as possible. ''We're going to earn our way back into the majority,'' he vowed.
BOGOR, Indonesia - President Bush said Monday he isn't ready to decide between rival calls to increase or scale back U.S. troops in Iraq. Unruffled by street protests against his policy, he said they were a healthy sign of democracy in this Muslim nation.
FALLUJAH, Iraq - Some 30 Sunni refugees seeking a safe haven from Baghdad sit under the shade of a camouflage net on the outskirts of Fallujah, waiting at a makeshift U.S. facility for city IDs.
CHICAGO - An experimental ultrasound technique that measures how easily breast lumps compress and bounce back could enable doctors to determine instantly whether a woman has cancer or not - without having to do a biopsy.
ANCHORAGE, Alaska - David Smith was a new arrival to the North Slope village of Nuiqsut last year when the former resident of upstate New York cooked up a few turkeys and vat of chili for the Eskimo community's Thanksgiving dinner.
WASHINGTON - The top U.S. commander in the Middle East warned Congress Wednesday against setting a timetable for withdrawing U.S. troops from Iraq, rejecting the arguments of resurgent Democrats who are pressing President Bush to start pulling out.
ATLANTA - US Airways Group Inc. made a hostile $8 billion cash and stock bid for Delta Air Lines Inc. on Wednesday, a deal that would create one of the world's largest carriers. The move came despite Delta's repeated statements it isn't interested in a merger.
WASHINGTON - Exotic animals captured in the wild are streaming into the U.S. by the millions with little or no screening for disease, leaving Americans vulnerable to a virulent outbreak that could rival a terrorist act.
BAGHDAD, Iraq - Kidnappers released about 70 people snatched in a mass abduction by suspected Shiite militiamen who answer to a key backer of the prime minister - a sign the militants went too far and Iraq's leader may be yielding to intense U.S. pressure to crack down on sectarian violence.
WASHINGTON - Americans' approval of President Bush's handling of Iraq has dropped to the lowest level ever, increasing the pressure on the commander in chief to find a way out after nearly four years of war.
WASHINGTON - Democrats embraced Rep. Nancy Pelosi as the first woman House speaker in history on Thursday, then quickly snubbed her, selecting Steny Hoyer of Maryland as majority leader against her wishes.
LEAVENWORTH, Kan. - An Army private convicted of leaking classified documents to WikiLeaks won an initial victory Wednesday to living as a woman when a Kansas judge granted a petition to change her name to Chelsea Elizabeth Manning.
WASHINGTON - The Supreme Court appears to be highly skeptical of laws that try to police false statements during political campaigns, raising doubts about the viability of such laws in more than 15 states.
WASHINGTON - A state's voters are free to outlaw the use of race as a factor in college admissions, the Supreme Court ruled Tuesday in a blow to affirmative action that also laid bare tensions among the justices about a continuing need for programs that address racial inequality in America.
LOS ANGELES - Astronomers have discovered what they say is the most Earth-like planet yet detected - a distant, rocky world that's similar in size to our own and exists in the Goldilocks zone where it's not too hot and not too cold for life.
The discovery of seven babies found dead and concealed in the garage of a Utah home has Americans struggling to comprehend what would drive a mother to allegedly kill her newborn babies.
BOSTON - Survivors, first responders and family members of those killed came together Tuesday to mark the anniversary of the Boston Marathon bombing with solemn ceremonies.
WASHINGTON - President Barack Obama praised outgoing Health and Human Services Secretary Kathleen Sebelius for helping to steer his health care law's comeback after a rocky rollout, even as he nominated a successor aimed at helping the White House move past the political damage.
LAKE BUENA VISTA, Fla. - The timeless Disney tune "It's a Small World" that wafts through our memories from past theme park vacations turns 50 this year, and on Thursday, Disney parks worldwide hosted a global sing-along.
MURRYSVILLE, Pa. - It was just before the start of class and the hallways were packed with students at their lockers or chatting with friends.
George Strait won his second entertainer of the year - 25 years after he won his first - and Miranda Lambert and Keith Urban teamed up to earn top honors Sunday night at a jam-packed Academy of Country Music Awards that had a little something for everyone.
FORT HOOD, Texas - An Iraq War veteran being treated for mental illness was the gunman who opened fire at Fort Hood, killing three people and wounding 16 others before committing suicide, in an attack on the same Texas military base where more than a dozen people were slain in 2009, authorities said.
FORT HOOD, Texas - A soldier opened fire Wednesday on fellow service members at the Fort Hood military base, killing three people and wounding 16 before committing suicide at the same post where more than a dozen people were slain in a 2009 attack, authorities said.
WASHINGTON - A flood of last-minute applicants rushed to sign up for health insurance on Monday, deadline day for President Barack Obama's health care law, with more than 100,000 people at a time using the fragile system despite a new spate of intermittent ills.
WASHINGTON - A hotly disputed Senate torture report concludes that waterboarding and other harsh interrogation methods provided no key evidence in the hunt for Osama bin Laden, according to congressional aides and outside experts familiar with the investigation.
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