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First couple of paragraphs
A common-catch-phrase is the one that goes, "There's no such thing as a normal person."
The question, though, is this: Why is there no such thing as a normal person?
Last 2 paragraphs
Still, as long as psychologists use the words 'normal' and 'abnormal' in the way that they do, we will always be able to make statements like: "It is normal to be a little abnormal." and "It is highly abnormal to be completely normal."
And, after all, such statements, while confusing, are also comforting.
Asimov discusses the meaning of normal and abnormal, and segues into the types of atoms that are found in the human bod where he talks about probabilities.
He also explains what "perfect gases" are.
Nothing really quotable or of more than general interest in this essay.