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This book is a classic in the study of Heraclitus' "Fragments". I have always found the Fragments inspiring. Their apparent simplicity, which hides greatness and richness of thought,  reminds me of mathematical formulas, small packages of endless enchantment. How to better summarize scientific discovery than in this Fragment?  "If you do not expect the unexpected, you will not find it; for it is hard to be sought out and difficult." (Heraclitus, Fragment DK B18, translated by John Burnet.)