"I grew up in a village of about 800 people surrounded by lakes and woods, and I think it's made a definite impact on me."

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Even a superficial glance is sufficient to show that all the innumerable forms in which the life-urge of Nature manifests itself are subject to a fundamental law - one may call it an iron law of Nature - which compels the various species to keep within the definite limits of their own life-forms when propagating and multiplying their kind.

— Adolf Hitler