Do you think you are a person who can concentrate easily and deeply? This IQ test will help you assess your ability to concentrate and discern details. IQ Test: How many faces are in this picture?” Are you ready for this visual challenge? You have 15 seconds to look carefully at the image below, not … Continue reading IQ Test: How many faces are hidden in the tree? If you fail, check out this psychology expert’s advice to improve your thinking skills.