Aha! Aha! Insight
Martin Gardner
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.
