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A chance detour to the island of Bali confronted Alfred Russel Wallace,
Darwin’s contemporary, with compelling evidence for evolution in the form of a
sharp geographical divide between the fauna of Asia and Australia—known as
Wallace’s line. In Where Worlds Collide, Penny van Oosterzee gives a sparkling
and beautifully illustrated description of this theoretical boundary and its
significance. Published by Cornell University Press, £14.50, ISBN
0801484979.