Whats your favourite book and why?

[Whateverist]

Trilogy?!
But.... but... I'm on the fourth book... Foundation's Edge.
And I have Foundation and Earth claiming to be #5.
And #6 is a prequel, Prelude to Foundation.

What Trilogy?! Where in the story did you leave off? Arkady?

Well... yes.  As in, that's considered "The Foundation Trilogy" with capital letters; the three portions of that group were written as a series in 1951, '52, and '53.  I know there are more books in the series written by Asimov, but the fourth wasn't published until 1982 (and it took significant pressure from Asimov's publishers to get him to do so).  I'll definitely read those someday - I'm sure they're great - but I feel justified saying that I've "completed the original Trilogy."

Hmmm, I wonder if he wrote the trilogy as a birthday present for yours truly.  He finished the third just in time.