Optical illusion: Can you spot the odd number in this image?
Optical illusion puzzles, popular recently, test mental agility by challenging observers to spot hidden objects. Today's puzzle involves finding a hid ...
A simple nasal swab could change how kids’ asthma is diagnosed and treated
Researchers at the University of Pittsburgh have developed a new nasal swab test that identifies specific asthma subtypes in ...
Only those with exceptional observation skills can spot the hidden animal in this optical ...
A clever zebra illusion once challenged viewers to spot a hidden animal's face formed by the zebras' stripes and positions.