Dr. Howard Luks didn’t think much about agility — the ability to move quickly while changing speed and direction — until movements that used to come easily became more chall ...

The social psychologist Jonathan Haidt discusses the “parents’ revolution” on smartphones that his book “The Anxious Generation” has ignited.

But just 10 years ago, Roan—who was born Kayleigh Amstutz—was living a very different life in a small town in the ...