Opening borders can have unexpected benefits; studies show alarming links between air pollution and dementia; and Native Americans talk about illegal immigration. (via AJ+)Actually, do we even need borders? The refugee crisis sheds light on how borders can create prisons out of conflict zones, but what’s the point? (via The New York Times)How pollution affects your brainNew studies are pointing to the link between air quality and dementia. Not just yetFormer New York Times columnist John Tierney would love to see recycling go away.