A fun and illuminating past time is to count the heresies that appear in these threads. Nestorianism is a big one.
Nestorianism is one that keeps popping up here, especially amongst the Calvinists.
Maybe everyone else was already aware, but I'm finding that Nestorianism is a part of reformed theology. I've just started looking into it but I've found this article so far, which may be of interest.
The more I look into the "reformed" belief system, the stranger it gets.