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In 1977, Purcell asked why liquid viscosities all stop at the same place?Liquids are hard to understand, yet today we can answer the Purcell question interms of fundamental physical constants fixing viscosity minima. With thePlanck constant setting the minimal viscosity, water and life appear to be wellattuned to the degree of quantumness of the physical world.

The Purcell question: why do all viscosities stop at the same place?