Skulls in the Stars: Levitation and diamagnetism, or: LEAVE EARNSHAW ALONE!!!

It’s hard to tell if the author is being snarky or really looks upon mathematical physics as a “mumbojumbo” that impedes progress. Taking the statement at face value, it highlights an important and semi-common misunderstanding of many physics theorems, and so I thought I’d take a qualitative stab at explaining Earnshaw’s theorem and its relationship to diamagnetic materials and magnetic levitation.