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After some cogitation, it is difficult not to agree with Herman Bondi (1919 - 2005), who in his book 'Relativity and Common Sense' says:
... The surprising thing, surely, is that molecules in a gas behave so much as billiard balls, not that electrons behave so little like billiard balls.
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Felix Alba-Juez (E=mc^2: The Most Famous Equation in History... and its Folklore (Relativity free of Folklore #1))