Man's effort to understand what we and our world are made of is one of the greatest adventure stories of the human race. It dates from the beginning of recorded history. Science first flourished 2500 years ago with the quest of the early Greek philosophers for an underlying unity to the rich diversity observed in world around them. They realized that the search for an understanding of Nature at a fundamental level in terms of basic processes and constituents necessarily carried them beyond the sensory world of appearance.

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