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And here鈥檚 a more portable sort of Penguin. This one is full of time from John Gribbin, whose In Search of the Edge of Time (拢6.99 pbk, ISBN 0 14 024814 5) summarises what we know and what we are speculating about time. Extremely useful for the would-be science-fiction writer (see wormholes), and those interested in the edges of science. And in Penguin鈥檚 60th year of publication, it鈥檚 a pity that only one science title was included in its 鈥淪ixty for 60p鈥� promotion (95 cents in the US), a great range of small-scale paperbacks. Well worth picking up: Stephen Jay Gould in Adam鈥檚 Navel writes with sharp elegance on why men have nipples, the existence of Adam鈥檚 navel and Sigmund Freud鈥檚 woeful ignorance of biology Penguin has Freud himself with Five Lectures on Psycho-Analysis. Penguin classifies Freud as a scientist which is open to debate in view of his lack of falsifiable theory.