The very arrangement of molecules is fluid: Tables can be clocks, faces, flowers.
So when we went to Bailey’s in Waverley Square with our retinue of nurses, the arrangement of atoms in our molecule was more complex than it appeared to the engineers’ wives sipping coffee at the counter and graciously pretending not to look at us.
There are no more uses of "molecule" in the book.
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They say they can genetically engineer bacteria or yeast to produce whatever molecules they need to replace gasoline.
That protein molecule is found in lower concentrations in the brains of people suffering ordinary age-related memory loss.