Today on Boston Public Radio:

• We opened the lines to hear our listeners' takes on Senator Elizabeth Warren refusing a Fox News town hall. Is this a winning strategy, or did she alienate the 2.5 million viewers who might have tuned in?

• Keith Lockhart, conductor of the Boston Symphony Orchestra, gave our listeners a preview of an event May 20 in partnership with the Kendall Square Orchestra: Symphony for Science.

• Bruce Bean, Wade Regehr, and John Gabrieli, neuroscientists from Harvard and MIT, will use a $9 million donation from Bob Broderick to study the effects of cannabis on the brain. They joined Jim and Margery at the Boston Public Library to discuss their research.

• Emily Rooney joined the show as she does every Friday for her famous list of fixations and fulminations.

• Boston Globe's interim editorial page editor Shirley Leung on a proposal for a marijuana equity fund.

• Members of the Congressional Black Caucus say a Joe Biden/Kamala Harris ticket would be a dream. Harris considers that option more of a nightmare. Under the Radar host Callie Crossley discussed that and more.

• New Yorker writer Adam Gopnik made the case for liberalism on the show, and in his new book, A Thousand Small Sanities: The Moral Adventure of Liberalism.

• We wrapped things up on a high note, with a Sing That Thing News Quiz, joined by Jared Bowen and Anthony Trecek-King.