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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.

China's health officials say the number of confirmed cases of the coronavirus has risen to 5,974 in 31 provinces with 132 deaths. People are asking why it took so long for controls to be implemented.

House Democrats held leadership elections Wednesday. Nancy Pelosi was re-elected despite facing an unexpected challenge from Ohio Democrat Tim Ryan. David Greene speaks with NPR's Susan Davis.

After two daily episodes, Das Coronavirus Update, a podcast by one of the world's leading virologists, shot to No.1 in Germany. When does a top coronavirus researcher find time to do a podcast?

The weeklong celebration of Kwanzaa is a perfect opportunity to revisit soothing, hearty winter foods, says celebrity chef Tanya Holland.

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.

Some Republicans are on the defensive about what they said or wrote privately after the Jan. 6 attack on the Capitol. NPR's Michel Martin discusses that with Harvard professor Steven Levitsky.

The dinosaur named Llukalkan aliocranianus was a predator with a menacing appearance and the ability to strike fear in its prey. Paleontologists said it roamed the Earth nearly 80 million years ago.

NPR's Ari Shapiro talks with Cecilia Rouse, chair of the Council of Economic Advisers, about Biden's State of the Union address and the impact of the war in Ukraine on the U.S. economy.