the macro aspect of magnetism…i.e., when the poles flip and begin to drift as mentioned in this article about the earth’s changing magnetic poles… how does this affect pemf application, intensity, quality, characteristic, etc of pemf, if at all?
the last time this happened was 42k years ago 
i have heard the earth’s magnetic field does affect our electronic devices … but what do i know 
just thought I’d share an article that (@bob) you may find interesting. 