"Doing research on intelligence is fascinating, and also sometimes frustrating. Like being a meteorologist, when you tell someone you work on intelligence you find that they start telling you about your own topic. So, Prof Ian Deary of the University of Edinburgh thinks that it is useful show people some real data that come from intelligence tests; opinions can then be founded on data, or at least one can query the data-gathering or its interpretations.
Without making assumptions about what intelligence tests measure or why people differ in their scores, he presents some results and invites people's reactions to them. He is still surprised by the fact that sitting down with one of these tests for three quarters of an hour or so and getting a score can have such far-reaching predictions, and cause so many arguments."