
The French mathematician Henri Poincaré once wrote about how he struggled for two weeks with a difficult mathematical proof. He set it aside to take a bus to a geology conference, and the moment he stepped on the bus, the solution came to him.
"An organism is not a static system closed to the outside and always containing the identical components; it is an open system in a (quasi-) steady state . . . in which material continually enters from, and leaves into, the outside environment." - Ludwig von Bertalanffy
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