What happened to the knowledge destroyed in Alexandria?

[Excerpt from TT: 1999-02-25]

[s5] When the libraries were burned at Alexandria, I am assuming much knowledge was destroyed. Can you tell us what some of that knowledge was? Have we as a culture rediscovered all, or is there something yet to reemerge?

[Michael_Entity] To elaborate on what was lost would require a different forum, and we can address this in full, more elaborately, when more time is available. We will say, however, that most of that knowledge would be difficult to gather, except through channeling or other psychic endeavors. Even then, it is not guaranteed to be accurate. There are a few elements surfacing after the turn of the century that are material.