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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.

Amherst College's Ilan Stavans discusses the sexual abuse allegations against Cesar Chavez.Comedian and The View host Joy Behar zooms in ahead of her "My First Ex-Husband" performance at the Huntington.Evan Horowitz of Tufts Center for State Policy Analysis walks us through his reports on rent control and income tax ballot questions.GBH's Jared Bowen joins us briefly to discuss "the unmasking of Banksy" and preview what's ahead on The Culture Show this week.

GBH News politics reporter Adam Reilly and Under The Radar's Callie Crossley join for 'Press Play' media analysis. For Live Music Friday, Puerto Rican singer, drummer, and composer David Rivera performs ahead of a show at Regattabar.Phil Eng, MBTA General Manager and interim secretary of transportation, joins for 'Ask the GM,' to answer our questions and yours.

BPR Full Show 3/19: Who Wants To Bring Back Dueling?

Harvard national security expert Juliette Kayyem on war in the Middle East and the resignation of Joe Kent, the now-former director of the National Counterterrorism Center.Chris Dempsey and Bill Straus join for a transit panel, focusing on plans for White Stadium, the Everett stadium for the Revs and World Cup plans at Gillette.Linda Bilmes, co-author of "The Three Trillion Dollar War" and Harvard Kennedy School public policy lecturer, discusses the financial cost of going to war in Iran.Meredith Goldstein of the Boston Globe Love Letters column discusses why some heterosexual women are hiding their boyfriends, how to make friends as an adult, and and update on the library phone booth.

CNN’s John King on national politics, food policy analyst Corby Kummer and NBC Sports Boston’s Trenni Casey