"Probably no branch of mathematics has experienced a more surprising growth than has... topology... Considered as a most specialized and abstract subject in the early 1920's, it is today [1938] an indispensable equipment for the investigation of modern mathematical theories."

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Plants don't think. Animals are guided by the power of instinct over which they themselves have no control. Animals have a certain kind of brain that makes it impossible to learn anything except very simple things. No generation of animals ever learns anything from any previous generation. We act like animals when we fail to use this magnificent piece of equipment.

— Sterling W Sill