Norway is the largest exporter of salmon in the world. And while some of those fish are wild-caught, many are raised in "fish farms"- large cylindrical pens made of nylon in the open water. Sometimes these farmed fish escape, mixing with the local population and causing ecological issues. In a story we first brought you in October, we see farmed fish in a Norwegian fjord and hear about potential solutions to the problem.

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Notre Dame's longest serving organist Olivier Latry tells of the cathedral's transformed acoustics. After a horrific fire in 2019, craftspeople resurrected the cathedral in just five years. The organist says the thorough cleaning of the instrument and the structure's stone makes the cathedral even more reverberant. Sign up for State of the World+ to listen sponsor-free and support the work of NPR journalists. Visit plus.npr.org.

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In a remote corner of southeastern Syria near the border with Jordan, some 7,000 people have been trapped in a refugee camp for more than nine years. They had fled Syrian regime forces and ISIS attacks and had nowhere else they could go. Our reporter is the first person to visit the camp and learns what the future of the residents looks like now that the regime has fallen.

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Ukrainian soldiers are struggling to stabilize defensive lines near the city of Pokrovsk, in the country's east, against Russia's much larger advancing army. We go to the front lines of Pokrovsk, to see how the fight is playing out.

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The outgoing U.S. national security advisor, Jake Sullivan, has been a top advisor and envoy to President Biden on issues of foreign policy. He talks to NPR about his view of recent events in the Middle East, the U.S. relationship with China and the future of the war between Russia and Ukraine.

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Former Syrian dictator Bashar al-Assad depended on his military to keep him in power for years. Then in just a matter of days, that same feared military disintegrated as rebel groups took control of the country. Our reporter in Damascus talks to former military members to understand why the military collapsed so fast.

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The film "All We Imagine As Light" is an Indian film that has won rare international acclaim from Cannes and the Golden Globes. But at home in India the international buzz was ignored and it was passed over as India's entry for the Oscars. Our correspondent in Mumbai, where the film was shot, explores why it is not receiving the same acclaim in India.

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As the future of Syria begins to emerge, one minority group is particularly fearful about how they'll be treated. The Alawites feel like they were mistreated by now-deposed dictator Bashar al-Assad, but because he was a member of that sect, they are also unfairly tied to him in the minds of other Syrians. We go to an Alawite neighborhood of Damascus to hear their concerns.

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The U.N. estimates over a 100,00 people have gone missing in Syria under the regime of Bashar al-Assad. And many families never knew the fate of their loved ones. Now that the regime has fallen, the search is on for the missing. We join some Syrians on that search.

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Russia continues to pound Ukraine with missile strikes, often targeting infrastructure like power plants. That has caused Ukrainians to endure power cuts even during the harsh winter. Our correspondent visits a power plant to see what it takes to keep the lights on in war.

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In the aftermath of the collapse of the Assad regime in Syria, how are the insurgents planning to resurrect the state?

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