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NPR's Rachel Martin and Puzzlemaster Will Shortz play the puzzle with David Lefkowitz of Los Angeles.

In the '70s, Dr. Herbert Needleman made a discovery that changed how people think about lead. His work led to a ban on lead in gasoline. But as seen in Flint, Mich., lead poisoning is still a concern.

NPR's Rachel Martin speaks to reporter Elizabeth Kulas in Melbourne about tennis star Novak Djokovic's fight to play in the Australian Open.

Members of the West African community who live around the 19-story apartment building that burned over the weekend are offering prayers and support. At least 17 people were killed.

With COVID-19 surging, schools may decide to send students home temporarily. What's going on behind the scenes, as school leaders fight to keep the doors open — despite staffing and safety issues.

One of the Americans killed was Staff Sergeant Bryan Black. His family was among those briefed over the weekend. David Greene talks to Hank Black about his son and the investigation.

NPR's Rachel Martin talks to Cecilia Muñoz, who headed President Obama's Domestic Policy Council and worked on President Biden's transition team, about immigration challenges.

As vaccine makers start testing re-tooled versions to target variants, how long will immunity hold up? And as vaccines open to all adults, some are still waiting. Why?

The launch corresponded with an unexplained order by the FAA to ground some flights on the U.S. West Coast.

After days of bargaining over safety precautions, the Chicago Teachers Union and city officials have reached an agreement to restart in-person teaching.