The world is busy building walls these days. Walls to keep people in, walls to keep people out. The emphasis is on separation, division, competition. In a word, conflict. Perhaps, though, the walls are not so much physical as mental. “I think no matter how you feel about where we are today,” the London-based writer and historian Rachel Cockerell says in an interview with us, “we have a duty to be curious about how we got here and where this all started.” Through listening and empathy, the walls come down.