The following two books are 100% IDENTICAL:



"Aha! Insight by Gardner, Martin". ISBN: 071671017X

&

"Aha! Aha! Insight by Gardner, Martin". ISBN: 0894540017



Don't be fooled by the different ISBN's - the covers are identical and flipping through both books, the pages are identical.



As for the book itself, I haven't had a chance yet to read it - I'm still trying to straighten out all the duplicates I have.

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