I just found out about a thing called grounding or earthing. It occurs when we are barefoot in contact with the earths surface and the electrical exchange between the earth and body is supposed to have some health benefits. The main promoter of this concept is a company with products to sell, which on its own should be enough to set off alarm bells. There does appear to be a lot of research done on grounding, but as explained here, there does appear to be a problem with all that research ranging from the lack of a control group to a lack of blinding of those doing the measurements to the research being done by the company that sells the product. No research to date, that stacks up to critical appraisal shows that grounding works. This is pure snake oil.