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PHILADELPHIA, Nov. 10 (UPI) -- U.S. researchers link increased use of carotid arterial stenting to poorer outcomes such as heart attack and stroke.

PINE PLAINS, N.Y., Nov. 10 (UPI) -- A gunman believed to be a parent held a school principal hostage Tuesday at Stissing Mountain High School in Pine Plains, N.Y., authorities said.

PRAGUE, Czech Republic, Nov. 10 (UPI) -- Two elite Czech soldiers serving in Afghanistan have been fired for wearing Nazi insignia on their helmets, Defense Minister Martin Bartak announced Tuesday.

BRUSSELS, Nov. 10 (UPI) -- The president of Iraq's Kurdistan region says the European Union should assist it in setting up its health, judicial and educational systems.

WASHINGTON, Nov. 10 (UPI) -- Only longtime use will determine whether new football helmet designs protect the brain against dangerous concussions, head injury experts said.

PARIS, Nov. 10 (UPI) -- The French foreign minister Tuesday dismissed a military option to resolve the Iranian nuclear crisis, saying resorting to force would be catastrophic.

PARIS, Nov. 10 (UPI) -- The European Space Agency says it has selected a British company to manage development of the first European student-built moon orbiter.

NEW YORK, Nov. 10 (UPI) -- U.S. markets wavered at the start of trading Tuesday after a strong rally Monday that sent the Dow Jones industrial average up 203 points.

COLD SPRING HARBOR, N.Y., Nov. 10 (UPI) -- U.S. scientists say they might have found a way to stop the growth of certain aggressive tumors for which there are currently no treatments.

FORT HOOD, Texas, Nov. 10 (UPI) -- The man accused of killing 13 people at Fort Hood, Texas, warned U.S. Army physicians 18 months ago against deploying Muslim soldiers to fight other Muslims.

WEST LAFAYETTE, Ind., Nov. 10 (UPI) -- Purdue University scientists say they've developed a technique that uses nanomedicine to help repair damaged spinal cord nerve fibers.

WASHINGTON, Nov. 10 (UPI) -- Nearly 200 key policy jobs in Barack Obama's administration remain vacant a year after he was elected president.

IRBIL, Iraq, Nov. 10 (UPI) -- Yazidi and Shabak minorities under attack in Iraq's Nineveh province are not receiving government protection, human rights advocates say.

ISTANBUL, Turkey, Nov. 10 (UPI) -- Syrian President Bashar Assad ratcheted up the rhetoric against Israel, calling for action against the Jewish state if it fails to return the Golan Heights.

TRENTON, Ontario, Nov. 10 (UPI) -- A Canadian teenager was recovering Tuesday, a day after military rescuers in aircraft plucked him from a free-floating ice floe in Hudson Bay.

JERUSALEM, Nov. 10 (UPI) -- Actions by the international community could lead to internal change in Iran, Israel's chief of staff said.

WASHINGTON, Nov. 10 (UPI) -- Former U.S. President Bill Clinton heads to Capitol Hill Tuesday to speak to the Senate Democrats' weekly lunch and push for healthcare reform, a memo said.

NEW YORK, Nov. 10 (UPI) -- Crude oil prices rose to nearly $80 per barrel on the New York Mercantile Exchange, despite the dissipating strength of a gulf storm.

SAN DIEGO, Nov. 10 (UPI) -- U.S. scientists say they've developed tools that allow them to visualize how different populations of cells communicate with each other.

Economists may hope stock markets rise slowly, but investors have breached the storm walls in recent days, putting U.S. markets into turbo drive recently.