"If the original ink proved tenacious, it could still be possible to make out the traces of the texts that were written over: a unique fourth-century copy of Cicero's On the Republic remained visible beneath a seventh-century copy of St. Augustine's meditation on the Psalms; the sole surviving copy of Seneca's book on friendship was deciphered beneath an Old Testament inscribed in the late sixth century. These strange, layered manuscripts--called palimpsests; from the Greek for "scraped again"--have served as the source of several major works from the ancient past that would not otherwise be known." --