How to Dunk a Doughnut: The Science of Everyday Life by Len FisherWeidenfeld & Nicolson, £12.99, ISBN 0-297-60756-1
You have to be very dedicated to...
From the archives in 1989, Wendy Grossman looks at a recent stunt by Mensa to identify Britain's brightest children, and why intelligence tests favour the demographic of their authors