To close apps on Apple Watch, press the side button and swipe left.

Closing iPhone apps generally isn't necessary, but can be useful if apps are misbehaving. Here's how to do it on any iPhone model.

Read all of Slate’s stories about the 25 Greatest Picture Books of the Past 25 Years. On Oct. 8, 2010, the New York Times ran a story on its front page: “Picture Books No Longer a Staple for Children.