explanations later in life. Books Bias in Mental Testing Bias in Mental Testing (1980) is a book examining the question of test bias in commonly used standardized tests. The book runs almost 800 pages and has been called "exhaustive" by three researchers who reviewed the field 19 years after the book's publication. It reviewed in detail the available evidence about test bias across major US racial/ethnic groups. Jensen concluded that "the currently most widely used standardized tests of mental ability -- IQ, scholastic aptitude, and achievement tests -- are, by and large, not biased against any of the native-born English-speaking minority groups on which the amount of research evidence is sufficient for an objective determination of bias, if the tests were in fact biased. For most nonverbal standardized tests, this generalization is not limited to English-speaking minorities." (p. ix). Jensen also published a summary of the book the same year which was a target article in the journal Behavioral and Brain Sciences to which 27 commentaries were printed along with the author's reply. Straight Talk about Mental Tests Straight Talk about Mental Tests (1981) is a book written about psychometrics for the general public. John B. Carroll reviewed it favorably in 1982, saying it was a useful summary of the issues, as did Paul Cline writing for the British Journal of Psychiatry. In 2016, Richard J. Haier called it "a clear examination of all issues surrounding mental testing". The g Factor The g Factor: The Science of Mental Ability (1998) is a book on the general intelligence factor (g). The book deals with the intellectual history of g and various models of how to conceptualize intelligence, and with the biological correlates of g, its heritability, and its practical predictive power. Clocking the Mind Clocking the Mind: Mental Chronometry and Individual Differences (2006) deals with mental chronometry (MC), and covers the speed with which the brain processes information and different ways this is measured. Jensen argues mental chronometry represents a true natural science of mental ability, which is in contrast to IQ, which merely represents an interval (ranking) scale and thus possesses no true ratio scale properties. Joseph Glicksohn wrote in a 2007 review for Canadian Journal of Experimental Psychology that "The book should be perused with care in order to ensure the further profitable use of [reaction time] in both experimental and differential lines of research." Douglas Detterman reviewed it