Every month, Traci Ruble joins a group of volunteers near a busy San Francisco street with a sign that invites strangers to participate in free listening. It’s called Sidewalk Talk, a non-profit organization with a mission to nurture human connection by teaching and practicing heart-centered listening in public spaces. Since it began in 2014, Sidewalk Talk has grown to over 700 volunteers worldwide and now has chapters in 19 cities around the globe.