today i bought a book called Infinite Worlds of Maybe

the tittle alone caught my attention, but then when i read the back and it said 
"For every situation there are two realms of possibility: Columbus did/did not discover America; the North/South won the Civil War. That is the intriguing premise of this highly unusual adventure by one of the most distinguished authors of science fiction. "
i knew i had to have this book.
and fifty cents later, its mine.
Apparently most people read this book in middle school?
(according to good reads)
where was i?