People with an IQ between 140 and 145 are regarded geniuses, and only around 25% of the world's population has this score. The levels of genius IQ scores are as follows: 115-124: superior (university students); 125-134: exceptional (post-graduate students). 35-54: high average (professional workers); 55-64: average (non-graduate staff); 65-74: low average (managers); 75-84: below average (teachers); 85-94: superior (scientists); 95-104: real genius (artists) Genius is defined as "a person who possesses outstanding intellectual ability that shows up in a wide range of activities from day to day life". So, genius is a very broad term that includes people who have many talents beyond their age level. It is not surprising then that most scientists believe that true genius is unique for each individual. Some researchers say that genius is more a matter of personality than anything else. They point out that many people who lack artistic talent or interest could still be great mathematicians or scientists. It is hard to say exactly how much intelligence is needed to be a genius. However, it is estimated that someone needs to have an IQ of 160 or higher to be called a genius. People who are very smart but lack any kind of practical knowledge or skills are said to be intellectuals, rather than artists or scientists.