Optical illusion: Only a genius san spot the mistake in the restaurant image in 6 seconds
IQ tests have been employed traditionally to quantify a person's intelligence. The puzzle problems pose issues in the form of ...
Brain teaser : Spot the hidden number in 13 seconds
Taylor Swift fans have a new challenge: spot the odd number 580 hidden among 590s within 13 seconds. This brain teaser tests observation and analytica ...