Over the long Memorial Day weekend, I rediscovered my copy of The Dow Theory, by Richard Rhea, from 1932.

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He approached Mr. Corbett, then the state's attorney general, with his theory that the New York copy was in fact Pennsylvania's.

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And a friend gave me a copy of a story by Leonard Michaels that's in theory written - narrated from the point of a view of a adolescent boy but actually is full of adult consciousness.

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The theory is that big differences come from the way in which certain RNA molecules copy DNA sequences into proteins.

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