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The national security expert and CNN analyst also touched on ongoing challenges to reopening schools in the fall.

Naturalist Sy Montgomery joined Boston Public Radio on Wednesday.

The Phase 1 study had successful results, but the next testing phases will be prolonged and much more challenging, Caplan said.

On Tuesday, NBC Sports Boston reporter and anchor Trenni Kusnierek joined Boston Public Radio.

On Tuesday, John King joined Boston Public Radio to discuss President Trump's messaging surrounding the coronavirus.

On Tuesday, Sen. Ed Markey discussed his re-election campaign, police reform, and the possibility of another federal stimulus package.

Today:National security expert Juliette Kayyem discusses the chaotic few days of peace negotiations with Russia and Ukraine.

Former secretary of public safety, Andrea Cabral, discusses how federal immigration forces are misusing "less lethal" weapons against protesters.Harvard's national security expert Juliette Kayyem on the latest developments in the Ukraine-Russia deal, plus Congressman Mark Kelly under Pentagon investigation for his involvement in a video from Democratic lawmakers calling on troops to defy illegal orders.Doug Gordon and Sarah Goodyear discuss their new book "Life After Cars: Freeing Ourselves from the Tyranny of the Automobile."Playwright Ryan Landry previews this year's Gold Dust Orphans holiday show.Boston Globe business columnist Shirley Leung discusses this year's holiday squeeze as consumers are expected to cut Black Friday spending for the first time since 2021.

CNN's John King zooms in for the latest national political headlinesTrenni Casey discusses Killington's independent era for skiing in the NortheastAbdallah Fayyad, Globe ideas writer, joins via zoom to discuss his latest piecesCongressman Jim McGovern calls into the show on the annual March for the Food Bank of Western Mass. Javier Marin, executive chairman of El Planeta, joins in person to discuss his new book: “Live From America: How Latino TV Conquered the U.S.”

Paul Reville, former education secretary, discusses the federal influence in our education systems — from efforts to dismantle the Education Department to Harvard Vocational School.Oscar-winning documentarian Mstyslav Chernov on his latest FRONTLINE PBS film "2000 Meters to Andriivka" that captures the Ukraine-Russia war from the point of view of frontline fighters.Reverends Irene Monroe and Emmett G. Price III join for All Rev'd Up on BPR. They discuss how the multiethnic faith community of New Bedford is faring amid immigration attacks. Giselle Byrd reflects on her appointment to the Massachusetts Commission on the Status of Women. Byrd, a community activist, executive director of Theater Offensive performing company, and a Black transgender woman, has received death threats since the news of her appointment.Folk singer/songwriter Tom Rush zooms in to celebrate his induction into Boston's Folk Americana Roots Hall of Fame.

Today:Ukrainian journalist and Oscar-winning documentary filmmaker Mstyslav Chernov presents his latest film “2000 Meters to Andriivka” tomorrow night on PBS. It offers a vantage point of war rarely seen in non-fiction films: a first-hand look at the toll of war on the frontline soldiers.