Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. The Vienna team stitched ...

Think you have sharp eyes? Find the hidden ring in this optical illusion in under 13 seconds. Most people take 25 seconds!

Optical Illusion: Remember those boards with weird patterns that used to also have hidden objects? The whole point of those boards used to be about how fast one can figure out what the image was! Well ...

Using ultra-fast laser pulses and special cameras, scientists have simulated an optical illusion that appears to defy Einstein's theory of special relativity. One consequence of special relativity is ...