Aye,,, there us the book of the dead. Doesn't mean that the modern day scientist observed, and thus made it the truth of generation knowledge for generation development. Means that to the believing Christian there may be an influential writing left to come post-humously, or there may be more interpretations for learning Science after the death for the new living. Why shouldn't yhe living learn from the dead unaware that the dead are no longer living?
"Aye...there us the book of the dead", doesn't illicit a recognizable impression with me. Is it a problem of editing, translation, or is it an obscure metaphorical construct? There isn't any evidence for the existence of the dead but it is likely we are not presently familiar with what we familiarly posses.