The Guide is more popular than the Celestial Home Care Omnibus; better-selling than Fifty-Three More Things to do in Zero Gravity; and more controversial than Oolon Colluphid's trilogy of philosophical blockbusters: Where God Went Wrong, Some More of God's Greatest Mistakes, and Who is this God Person Anyway?
In many of the more relaxed civilizations on the outer eastern rim of the Galaxy, the Hitchhiker's Guide has already supplanted the Encyclopedia Galactica as the standard repository of all knowledge and wisdom. Though the Hitchhiker's Guide has many omissions and contains much that is apocryphal (or at least wildly inaccurate), it is more successful than the older, more pedestrian work for two important reasons:
First, it's slightly cheaper.
Second, it has the words Don't Panic! inscribed in large, friendly letters on the cover.