Another cause of change one less noticeable but fundamental is the modern growth of population closely connected with scientific and medical discoveries. It is interesting that the United Nations has set up a special Commission to study this question.

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I've got a real sense of three-dimensional geometry. I can look at a flat piece of fabric and know that if I put a slit in it and make some fabric travel around a square then when you lift it up it will drape in a certain way and I can feel how that will happen.