Today on Boston Public Radio we're on tape, bringing you some of our favorite conversations from recent years. We begin with Greater Boston’s debate featuring the Democratic candidates for Massachusetts attorney general. It was the first televised debate between former state prosecutor Quentin Palfrey, labor attorney Shannon Liss-Riordan and Boston City Councilor Andrea Campbell – all vying to replace Maura Healey. Ben Shattuck talks about about following the hikes of Henry David Thoreau in “Six Walks: In the Footsteps of Henry David Thoreau.” Howard Bryant discusses his book, "The Heritage: Black Athletes, a Divided America, and the Politics of Patriotism."