To test your hawk-eye vision, try to find all the errors in this poultry farm within 11 seconds!

There are several different ways to test observation skills withan IQ test. But, solving the brain teaser challenge ...

True eye test: Only the sharpest eyes can correctly guess the series of numbers in 20 seconds

A challenging optical illusion tests eyesight and concentration by hiding a number within a dizzying pattern. The article ...