Our ability to perceive the rich, three-dimensional nature of the world depends on stereopsis. It is a process by which the brain combines slightly different images from each eye (binocular disparity) ...

A stereogram optical illusion is a fascinating visual puzzle that hides a 3D image within a 2D pattern. At first glance, it appears to be a random collection of repeating designs or colourful dots.

This is an updated version of an article published on July 15. Hannah Hampton was not supposed to make it as a professional athlete. The doctors told her it would not be possible. That professional ...