I think the biggest and most significant accomplishment of the the 20th Century was distinguishing that you can muscle testing.
The original idea of that, which they called muscle testing, was that the body knows what’s true and what’s not. Unfortunately, the body what’s good for it, but not exactly the way muscle testing has been using and abusing it.
Thousands of charlatans suddenly had a proof that they know what they are talking about, and they could sell the wares of other charlatans, all kinds of gizmos, devices, supplements, spiritual hocus-pocus… you know what I am talking about. If you don’t: you are probably one of those charlatans.
I am not saying that some issues could not be decided based on the body’s response: most definitely yes. Chiropractors were the first to use it successfully and ethically, only to bastardize it to sell supplements: you make more money selling supplements than doing chiropractic: the chiropractic brings them in, but you get paid for much more than what you do by the supplement manufacturers. As much as 50% commission.
I have heard that the shipping and handling you pay, also pays for the bottles and their contents: 90% profit margin? WTF!
And yet, I say that muscle testing, or the idea that you can ask a higher authority and use the yes/no answer of the body to get guidance, was revolutionary.