Sometimes the occasion for giving flowers is just because — just because you love someone, just because you were thinking of them or just because you’re there. 

Anna Malaika Tubbs' spoke about her debut book "The Three Mothers: How the Mothers of Martin Luther King, Jr., Malcolm X, and James Baldwin Shaped a Nation" at a Boston Public Library conversation Tuesday. Her book highlights Alberta King, Louise Little and Berdis Baldwin, forgotten changemakers in U.S. history.