Not all screen time is created equally. Experts explain why quality matters more than quantity and how parents can rethink their rules for devices. A young child watches cartoons on a laptop at home.

For instance, our top pick is the BenQ PD2725U, and it’s one of the best 4K monitors you can get, offering a beautiful 27-inch screen and impressive color accuracy. It comes with plenty of ...

As we talk, a team member nearby hands a bucket heavy with muck to a volunteer, who pours it into a box with a fine-mesh screen ... drawn in what may have been invisible ink made with urine ...