People, especially younger people who have never known a world without Instagram and texting and what all else, know things. And the things they don’t know, they know how to learn, if they feel like it. ADVERTISEMENTAnd these days are when many families are preparing to send their sons and daughters off to college for the first time. Six decades ago, Dowling meant as little to me as Chamberlain High School must have meant to my new roommate. The first night in the dorm, instead of calling “lights out,’’ the manager cut the power to the rooms.