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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.

Some antidepressants inhibit a liver enzyme that converts common opioids into their active form. The interaction may reduce the effectiveness of certain opioids for people taking both medicines.

The company had recently whittled down its list of would-be Martians to 100 names, after more than 202,000 people applied to leave the Earth for a one-way journey.

Trump told CBS News that he would like to keep U.S. troops in Iraq to "watch Iran." The statement is causing a stir in Iraq, where roughly 6,000 Iraqi forces are stationed to help Iraq fight ISIS.

"I've lost a lot to get here. I've had to sacrifice a lot. I've been through a lot," says Nigerian-born Efe Obada, who made the cut with the Carolina Panthers. "All the suffering paid off."

At the Big Iron Farm Show in North Dakota, the usual concerns about crops have been heightened by another big worry: a trade war with China that's already driven soybean prices down sharply.

Presidents Trump and Obama both have had to decide whether to take action against the Assad government after civilian deaths.

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 national security adviser said the U.S. will leave the INF Treaty "in due course" — and that President Trump and Russian President Vladimir Putin would like to speak directly again next month.

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.