[after]
It was a bit ago... He started with a lecture on ghosts... [She keeps her discomfort at that topic under tight wrap, just shifting the notebook in her grip before shifting topics]
Well, I began with this class because the subject was close to what is present on my world: beings that consume humans. That's what I'd recommend, to start with something similar to what you know of or what's possible in your world. It's easier to build your way up than to begin with concepts and information that are radical.