This question has no single or simple answer. One is that earth emits geopathological energy along with the man made EMF's which causes people to become ill by draining their magnetic life-force. In the 1930s German physicist Paul Dobler discovered water in underground veins radiates EM in a narrow band which can expose film placed in light opaque envelopes above the veins. Like DNA, hair and muscle are spiral fibers, braided and supercoiled . Iron red in hemoglobin and cobalt blue in vitamin B12 are a magnetic waveform chalice to transport electrons in blood and nerve.
Cobalt is a silvery, bluish-white, odorless, and magnetic metal .
The fume and dust of cobalt metal is odorless and black . Cobalt is often alloyed with other metals due to its unusual magnetic strength and is used in electroplating because of its appearance, hardness and resistance to oxidation. Weak ELF EM alters calcium movement in cell membranes to change neural chemical action . Vitamin B-12 may improve circulation and memory due to lessening effects of radiation induced vascular dementia. You must do your own survey of the environments you reside in.