Intelligence quotient, as a useful means of measuring brain capacity, has come increasingly into the public eye in recent years. This famous book (and its seque

In this sequel to Know Your Own IQ, Eysenck responds to criticisms, providing five new tests of the standard type as a check. He also provides three specific te

Over the last few decades, economists and psychologists have quietly documented the many ways in which a person's IQ matters. But, research suggests that a nati

Find out where you rank on the IQ scale by taking this entertaining, self-scoring test.

IQ tests are routinely encountered in recruitment for various industries, including for jobs in the government, armed forces, and education as well as industry