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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:Yale's Jeffrey Sonnenfeld discusses Trump's tariff plan; and the CEO response to this presidential administration.And, naturalist and author Sy Montgomery brings us the latest headlines from the non-human world: Urban spiders weaving noise cancellation into their webs, and octopuses escaping sharks by hitching a ride on their heads.

NBC Sports Boston's Trenni Casey discusses the launch of the first US professional women's 15s rugby league and a controversy surrounding influencers and hot yoga. Harvard security expert Juliette Kayyem discusses the justice department seeking the death penalty for Luigi Mangione and the results of Tuesday's supreme court election in Wisconsin.Jeffrey Sonnenfeld of Yale School of Management discusses Trump's "liberation day" tariffs and the response (or lack-thereof) by CEOs to the Trump administration.Naturalist Sy Montgomery explains how urban spiders build soundproofing into their webs and why an octopus hitched a ride on a shark.

Today:Rufus Gifford, former ambassador to Denmark under Barack Obama -- who more recently worked on the Biden/Harris and Harris/Walz campaigns -- discusses Donald Trump's rhetoric about Greenland.Carol Rose, executive director of the ACLU of Massachusetts, discusses their organization joining onto the legal team in defense of Tufts grad student Rümeysa Öztürk.

ACLUM executive director Carol Rose discusses the local ACLU chapter joining on to legal filings in support of Rümeysa ÖztürkCorby Kummer on Trump's immigration impacts on farm workers and unions.Rufus Gifford, former Ambassador to Denmark parses through the Trump administration's rhetoric around Greenland.CNN's John King on national political headlines & Wisconsin election.

Boston Globe business columnist Shirley Leung recaps Mayor Wu's appearance on The Daily Show, Canadians upset over U.S. annexation talk and the latest on the White Stadium development. Former secretary of public safety Andrea Cabral discusses Cambridge City Counselor Paul Toner's refusal to resign over the brothel scandal, and law firms refusing to represent Trump opponents. Andrew Natsios used to chair the Mass GOP and served as USAID administrator under George W. Bush. He reacts to the recent dismantling of the aid agency. Vulture podcast critic Nick Quah shares some of his picks for the best podcasts of the year so far, including GBH News' own "Scratch & Win."