In this video, I explore how my dad performed his 20-year disappearing illusion.

A viral Reddit illusion showed a bird hidden among pebbles, leaving users baffled as they struggled to spot it.

Find out how tessellation is when shapes fit together in a pattern with no gaps or overlaps. Shapes with 4 sides Explore four-sided shapes looking at straight lines, curved lines and 2D shapes ...

The biggest stories of the day delivered to your inbox.

Read all the stories you want.