What is that? CIA? No, that’s “something” which makes us able to solve a vast variety of problems in every aspects of life. If we have more of that “substance” we perform fast and easy. One can check the existence of that in his brainJ and measure the level of that with different tests. You probably know about an IQ (Intelligence Quotient) -the ratio of one’s mental age to the chronological age (multiplied by 100) If you’re interested how clever you are just type” IQ” in Google’s search bar and enjoy hundreds of IQ tests .You’ll find IQs even for kids. There is a so-called “borderline intelligence” which is the minimal IQ necessary for someone to function normally and independently. I hope you’ll not get embarrassedJ. The estimated average IQ is 100 by definition. People with less than 90-80 are still OK but on the slow side .All semi-skilled people have between 90-110 score.

Teachers, doctors, PhDs, lowers, etc may have all 120 and higher. They make about 10% of the population. You can compare your IQ score with the other people’s IQs and get an idea how much grey matter you got from god in your skull. For instance I'l bring here some estimated IQ scores of famous people. The highest among estimated IQs is Leonardo Da Vinchi's IQ (220). This is the range of the genius individuals. Famous physicist Isaac Newton got 190, Albert Einstain -160 .Among USA presidents Richard Nixon's IQ is the best (143), among singers Madonna and Shakira both got 140. Now tell us how much is your IQ?