This Week: Hard to imagine there are arts headlines to compete with election news, but here goes: Science tries to explain why we’re ideologically segregated… It’s not just politics – arts and entertainment don’t really know what their audiences want… Even the most-respected arts coverage is being cut back… Infighting on the jury of the National Book Awards point to how deeply we’re divided… To end on an upbeat note, read Lin Manuel Miranda on the power of arts education.