A study asked people to spend fifteen minutes a week walking outdoors while deliberately looking for things that amazed them, and by the eighth week their selfies showed them smaller in the frame and smiling more.

A senior man with a walking stick looking across a mountain landscape

There is something wonderfully strange about a psychology study that finds part of its answer in the way people frame a selfie. In 2020, a team led by Virginia Sturm at the University of Califor...