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Events on Thursday 14 August 1952 1
1952The Chemical Basis of MorphogenesisWhy the leopard has spotsWhile under hormone treatment, Turing publishes on how two chemicals diffusing and reacting at different rates can spontaneously produce stripes, spots and spirals out of a uniform starting state. It explains why biological pattern does not need a blueprint. Largely ignored at the time, it is now foundational in mathematical biology, and the mechanism carries his name.