NEW YORK (AP) — More than a dozen millennials gathered in a brownstone apartment in Brooklyn and placed their phones in a metal colander before two hours of reading, drawing and conversation — anything but staring at screens . A similar scene played out a few miles away, in an early 20th-century cardboard box factory turned high-end office space. Nearly 20 people in their 30s stared at their cellphones for a few minutes. Then they set them down and looked at their bared palms for a while. Then