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There is a winner in one of the country's biggest middle school science competitions: the Broadcom MASTERS. Ishana Kumar looked into how retinal fatigue may play a role in seeing "imaginary colors."

A data analyst listened to decades of Billboard's top tunes and discovered that a once-ubiquitous compositional tool, the key change, has all but disappeared from modern hits.

Suicide killed more U.S. troops last year than combat in Afghanistan, a trend that's likely to continue this year. The causes and remedies are complicated, but Fort Bliss in Texas has bucked the trend. Suicides have declined there, after implementation of an interactive suicide prevention program.

Last year an appeals court overturned the seven-year sentence against the controversial former Italian leader. Judges on the Court of Cassation backed that decision Tuesday.

Pakistani intelligence officials say Sangeen Zadran, a commander of the al-Qaida-linked Haqqani network, was killed in North Waziristan.

British Air Chief Marshal Sir Stuart Peach says the Kremlin's improved naval capabilities pose a risk to communications and Internet cables that would be an economic catastrophe if severed.

The acclaimed Concertgebouw Orchestra issued a warmly worded statement Tuesday saying its disagreements with the conductor have been resolved by both parties.

Roughly 400,000 votes in all were cast in the race for Iowa's 2nd Congressional District. Hart maintained that nearly two dozen valid ballots were not counted properly.

Arizona Sen. John McCain has won the N.H. GOP primary, largely because of the support of the state's independent voters. McCain also did well among Republicans disappointed with President Bush, according to exit polls.

One of the facilities Samsung is building will be the size of 11 football fields, Commerce Secretary Gina Raimondo said. The new investment will create thousands of jobs, the White House said.