Knowledge about air duct cleaning is in its early stages, so a blanket recommendation cannot be offered as to whether you should have your air ducts in your home cleaned. The U.S. Environmental Protection Agency (EPA) urges you to read this document in it entirety as it provides important information on the subject.
Historically, IQ is a score obtained by dividing a personâs mental age score, obtained by administering an intelligence test, by the personâs chronological age, both expressed in terms of years and months. The resulting fraction is multiplied by 100 to obtain the IQ score.
An official IQ test has to be administered in person ... the Wechsler-IV Adult Intelligence Test takes about an hour and a half to two hours. An average score is 100; test scores follow a bell curve, with a high concentration between 85 and 114 (68% of people), and very few scores at the ends of the curve. There isn't really an accurate test on the Internet ... you can take some to see what one is like; for example, Mensa has a test on their website.