@dmac67 - confirmation bias. Yup. Since you are aware, check an out of print, but easy to find book called "The Biomedical Bestiary'. Published in the mid-80s, chapters are still used in epidemiology classes today. It explains - in a biomedical context - a lot of this hobby, as well as many misunderstandings in medical research. 'Measurable But Not Meaningful' is another favorite chapter.
Shakti Stone
Has anyone ever tried one of these? When placed on top of components,they claim it reduces electromagnetic interference.Seems like kind of a questionable claim.