"...the source of all great mathematics is the special case, the concrete example. It is frequent in mathematics that every instance of a concept of seemingly generality is, in essence, the same as a small and concrete special case."

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People need open space. People need to bring their children into an area where they can play without restriction." And I was told, "This is development." And I said, "That is not development, definitely not sustainable development, definitely not responsible development. People need fresh air. They can do without buildings. They can do without concrete. But they cannot do without fresh air.

— Wangari Maathai