Test your eyes! Only those with 20/20 vision can find the hidden bottle in this optical illusion picture in 5 seconds. Can ...

Have you ever observed how a pencil appears bent or split when partially submerged in water? That is caused by the refraction of light and is a perfect example of a literal illusion. Now if you ask, ...

Daniel Joyce does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...