Details:

precalculus: "Precalculus is the preparation for Calculus. The course approaches topics from a function point of view, where appropriate, and is designed to strengthen and enhance conceptual understanding and mathematical reasoning used when modeling and solving mathematical and real-world problems. Students systematically work with functions and their multiple representations. The study … Read more

I'm guessing that angels are good story-tellers.  (Even after he "fell", Lucifer was able to sell Eve the greatest bunch of misinformation in history.)

Possible moral: Be sure which angel your are listening to.

(No comment on "other presences"---I would tend to avoid such as they, if they even exist.)

And from one of my sources:

"The word 'angel' … Read more

They probably do while they're playing cards !