Look closely at this picture. At first glance, you can see a big tortoise in the centre of the image. But look closer, and ...

DES MOINES, Iowa (AP) — Barnaby, the 70-or-so-year-old Aldabra tortoise at Blank Park Zoo, has a problem. In his left eye, which is shiny and black like an onyx gemstone, there's been an off-and-on ...

An Optical Illusion is a type of visual illusion where our brain perceives an image that is different from its actual ...