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Harvard University is investigating 125 students for possible cheating on a final exam last spring. An investigation showed that nearly half the students in an undergraduate government class may have collaborated or plagiarized on a take-home test. If confirmed, it would be the largest cheating scandal at the university in recent memory.

A few months ago health workers discovered a new variety of coronavirus that killed one man and hospitalized another. Now the virus has infected four more people in the Middle East. How they got sick is a question scientists would like to answer.

With growing controversy over the risk of permanent brain injury in contact sports, researchers find an association between repetitive head trauma and brain disease in samples taken from deceased athletes. Many were professional football players.

Karl Rove's tax-exempt Crossroads GPS group said it was interested only in advancing issues, not engaging in electoral politics. But now it's running a minute-long ad telling viewers to vote for Mitt Romney — with no mention of those very issues it had been saying were central to its mission.

President Obama has canceled re-election campaign events Tuesday in Colorado and Wisconsin, staying in Washington to oversee the federal response to Sandy. Republican challenger Mitt Romney has also scaled back his campaigning. The superstorm has introduced a new and unpredictable element into the presidential race, just one week before Election Day.

Haiti had documented 54 deaths caused by Sandy — most in the nation's southern peninsula, which points toward Jamaica. Another 21 Haitians were still counted as missing, and many fear the death toll will rise as officials reach affected areas isolated by impassable roads and ruined bridges.

A federal appeals court has thrown out Texas' redistricting plan, barely two months before the November election. Carrie Johnson talks to Melissa Block about ruling.

What rankles so many of Lance Armstrong's detractors is the sense that somehow, he artificially enhanced himself to reach seemingly superhuman heights. Yet the story of modern humans, argues philosopher Alva Noe, is a story of our integration with artificial and mechanical enhancements.

With a jutting chin and growing fearlessness, Republican vice presidential candidate Paul Ryan delivered a GOP convention takedown of President Obama Wednesday night, catapulting an already ugly campaign to a whole new level.

More than 100,000 people have fled to refugee camps in South Sudan to escape fighting in Sudan and find food. Heavy rains have depleted supplies and raised mortality rates above emergency levels. The United Nations has launched emergency airdrops of food to help the refugees.