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.

Digital ethicist Tristan Harris once noted the following: We check our phones more than 150 times per day. Knowledge workers spend a third of their day in email. Teenagers (aged 14–17) send 4,000 ...