"They didn't have to kill him…He never drank from the altar of bones."  Cryptic dying words from a murdered homeless woman in present day San Francisco unlock a decades-buried secret that changed history.  Now a pair o...

Enjoyable mental exercises to help boost performance on IQ tests This engaging book offers readers the ultimate in calisthenics for the brain. Using the same fun, informative, and accessible style that have made his previous bo...

IQ and Personality Tests contains hundreds of practice questions for aptitude tests and personality questionnaires. The personality questions look at attitudes and values, often in an entertaining way. The aptitude questions are organ...