Foundation is an interesting book, as its quite old and was originally written as a series of short stories (as much early science fiction was). Because I am reading the books of the extended Foundation series in the order that Asimov recommended towards the end of his life, I have read the two prequels to Foundation (Prelude to Foundation and Forward the Foundation) before Foundation itself. This means that the time line is a little inconsistent, specifically about how the Foundation project ends up on Terminus (Was it lobbying or exile? Did Hari go or not?). That’s not too bad though, and the book is very good.