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Harvard University researchers probed the way ADHD is assessed by taking advantage of a quirk found in many U.S. school systems that means some kids are a year younger their classmates.

Despite the president's criticism of the alliance, his administration has spent far more on a European defense program than did the Obama White House. U.S. troop levels in Europe have also risen.

The talks showed deep divisions, as small countries highly vulnerable to rising seas and powerful storms were at odds with wealthy, high-emitting countries like the United States.

The Mexican government, faced with thousands of destitute migrants on their side of the U.S.-Mexico border, is inviting them to apply for jobs in Tijuana.

With the Dow swinging up and down hundreds of points in a day, investors are feeling queasy. One economist says uncertainty in the stock markets may mean turbulence will continue in the new year.

Storms, warmer waters and coral-eating starfish have harmed the iconic coral reef system off Australia's coast. Now the Australian government has announced a plan to boost funding for the reef.

The average tax cut would be $1,600 in 2018, but the average household earning more than $1 million would get a nearly $70,000 cut.

Given a choice, bonobos tend to prefer people who act like jerks and dominate. That's very different than humans, who even as infants consistently prefer people who are cooperative and not mean.

Snipers. Specially trained dogs. Multiple layers of security screening. Detectives in hotels. After recent attacks, New York and Las Vegas are seeing beefed up security this year.

Scientists have found a group of worms that haven't reproduced sexually for 18 million years. Normally that would be a recipe for quick extinction, but these little guys seem none the worse for wear.