Brits have been left scratching their heads at an 'impossible' brainteaser that hardly anyone can solve. Puzzles and riddles are a great way to occupy the kids for a couple of minutes when they inevitably refuse to go out and play in the miserable winter weather . Researchers have also found they can actually positively impact the central nervous system, leading to improved cognitive functions including better concentration levels. However, to solve this baffling brainteaser - which went viral