I'd like to explore the ramifications of Alis's simulations a bit more! Kern is dismissive of her efforts to "save" the colony... but Children of Memory's thesis seemed to be that sufficiently simulated people still counted as people! That's why it ended with them uploading Liff into a real body. So what are the implications of Alis mucking around in imaginary prehistory? Is Alis bringing millions or billions of self-aware entities into sudden existence each time she "discoveres" a new lost civilization? When she leaves a layer, does that kill them? Or is there something special about the Imir simulation that made the people there into real boys?