An optical illusion challenges viewers to find a hidden four-sided star, claiming that only optimists can spot it. The illusion tests people's perception, suggesting that an optimistic mindset ...

The square-based pyramid, a shape which usually has four sides, is the most famous one at the Giza pyramid site. However researchers actually claim there are eight sides to it, making it an ...

A confusing brain teaser can only be solved by people with a high IQ in 30 seconds or less. The stargazer test asks viewers ...