Chances are, you've fallen victim to earworms — pesky songs or melodies that get stuck in your head and just won't get out.

Research suggests that there are psychological reasons why some songs are more likely to stick, including memory triggers, emotional states, and even stress. Some researchers hope to better understand why this happens and figure out what, if anything, music memory can teach psychologists about how to treat patients dealing with memory loss.

A Department of Education study found from 2009 to 2010, black students were 3 1/2 times more likely to be suspended or expelled than white ones. Though the reasons are unclear, many argue harsher punishments push many black and Latino students out of schools and into the criminal justice system.

The NFL found some two dozen players for the New Orleans Saints took part in a pay-for-hits program that paid bounties for knocking specific players out of games. Those involved likely face fines or suspensions. But lawyer Eldon Ham argues that doesn't go far enough, and proposes criminal charges.

In Afghanistan and other conflict zones, the military is often first on the ground, followed by diplomats, contractors and journalists. Next, in many cases, are aid workers: People who work for private organizations and strive to remain impartial in some of the world's most dangerous places.

The United Nations special rapporteur on torture has reached the conclusion that the United States violated some of the rights of the Army private accused of leaking classified information to WikiLeaks.

Pfc. Bradley Manning has been in U.S. custody since May 2010 and as we've reported, Juan Méndez, the U.N.'s top torture official, has already had some tough words for the U.S. leading up to this report.

Farms may conjure an image of a pastoral landscape, with children running and frolicking in green pastures. But farms do come with their own dangers. And there's plenty of argument on what should be done to ensure the safety of children who live or work on farms.

The U.S. Department of Justice has blocked a new voter ID law from going into effect in Texas. The department says the state failed to show that the law would not deny or limit minorities' right to vote. It's the second state voter ID law the department has blocked.

USS Enterprise, the world's first nuclear-powered aircraft carrier, is beginning the last deployment in her storied 50-year career on the frontlines of American sea power.

Known as the "Big E", she was among the vessels dispatched to the waters off Cuba during the October 1962 missile crisis with orders from President Kennedy to enforce an air and sea blockade of the island nation.

Rising gas prices have many voters looking for someone to blame and President Obama appears to be as good a target as anyone, a new Washington Post/ABC News poll suggests, with the president's approval rating falling from 50 percent last month to 46 percent recently.