„The interest of research workers has frequently been focused on the phenomenon of regularly shaped crystals suddenly forming from a liquid“

The Development of Quantum Mechanics (1933)
Contexto: The interest of research workers has frequently been focused on the phenomenon of regularly shaped crystals suddenly forming from a liquid, e. g. a supersaturated salt solution. According to the atomic theory the forming force in this process is to a certain extent the symmetry characteristic of the solution to Schrödinger's wave equation, and to that extent crystallization is explained by the atomic theory. Nevertheless this process retains a statistical and — one might almost say — historical element which cannot be further reduced: even when the state of the liquid is completely known before crystallization, the shape of the crystal is not determined by the laws of quantum mechanics. The formation of regular shapes is just far more probable than that of a shapeless lump. But the ultimate shape owes its genesis partly to an element of chance which in principle cannot be analysed further.

Última atualização 22 de Maio de 2020. História
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Werner Heisenberg2
1901 - 1976

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„The Coolidge Bull market was a remarkable phenomenon. The ruthlessness of its liquidation was, in its own way, equally remarkable.“

—  John Kenneth Galbraith, livro The Great Crash, 1929

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—  Diederik Stapel Dutch social psychologist 1966

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