Discussing the safety of children, Jonathan Haidt, professor of ethical leadership at NYU Stern and author of The Anxious Generation, said that parents shouldn’t focus on restricting their child’s exposure entirely but on the habits they form. He suggested that children don’t need smartphones until “at least high school” and that they don’t need to be exposed to the technology to be able to learn how to use it at the age of 15. “Let their brain develop, let them get executive function, then you can expose them.”