Bookcrossing

I have at last found proof that intelligent life may yet (or used to) exist in Castroville.  I view these signs with the same vigor and expectation as a paleontologist finding fossils.  Proof that life existed in some form an indeterminate length of time ago, but probably no longer exists.  Valiant Bookcrosser of the past, I hope you didn't perish in some sort of ancient asteroid fallout like your reptilian friends.