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The National Academies of Sciences, Engineering and Medicine sorted through 10,000 studies to determine the good and bad health effects of marijuana. Tight drug restrictions impede research, they say.

The Berlin Phil's Simon Rattle says the clock is ticking and the Chicago Symphony's Riccardo Muti has the flu. All the classical music world's news, collected for your pleasure. Plus: Sotheby's lets others sell violins and a tenor gripes about models.

Army Surgeon General Kevin Kiley has abruptly stepped down, requesting retirement. He is the third top Army official to depart amid fallout over the way wounded soldiers were treated at Walter Reed Army Medical Center in Washington, D.C.

President-elect Joe Biden has named several members of his White House senior staff as the transition efforts for the new administration continue.

One of the biggest topics President Obama is expected to discuss with Chinese President Xi Jinping this week is the hacking of U.S. companies by China. American officials say the issue threatens relations between the countries, and the U.S. is threatening to impose sanctions.

For NPR's series #RaceOnTech, we are meeting the diverse men and women who work in America's tech and science fields, like Mamie Parker, a fish and wildlife biologist who's a pioneer in her field.

Janet Yellen is on President Obama's short list to replace Ben Bernanke at the Federal Reserve.

Secretary of State Antony Blinken insists U.S. support for Israel has not left it isolated, despite anger over Israel's offensive in Gaza. It's just one of the crises he's looking at as the year ends.

An official assessment by Gen. Stanley McChrystal, the top U.S. commander in Afghanistan, concludes that after eight years, the U.S. and its allies have failed to focus on and win over the Afghan people. He also calls for more troops to ensure victory over the Taliban and al-Qaida.

Also: Kenya's president takes the oath of office for a second term; President Trump will visit Capitol Hill today; and the Bali volcano keeps erupting.