I came across this article:
https://www.sciencedaily.com/releases/2024/04/240423113133.htm
"Existing devices are effective, but lack the necessary precision needed for some applications, such as cochlear implants or vagus nerve stimulators.
"There are several neurostimulation devices on the market -- some are already FDA-approved for patient trials, some are pending approval," said author Renata Saha. "But each of them has one caveat -- they stimulate a large population of neurons, including neighboring cells that are not supposed to be stimulated. The medical device industry is in search of a device or technique that can stimulate neurons at a single-cell resolution.""
That's an example of selecting only the desired facts from research. Vagus nerve stimulation may show results in labs, but the devices offered on the market don't match the capabilities of the lab's equipment. The lab might use inserted micro-electrodes, rather than convenient stick-on skin electrodes. I wouldn't be surprised if some scammer offered stick-on (large) coils, quoting appropriate parts of a proper study, such as "magnetic coils" but leaving out the
micro part and the
inserted part.
Finding the truth in marketing claims can be tricky. Students would be better off with classes in how to read marketing claims than classes in memorizing who ruled which country hundreds of years ago. Courses in rational thinking would be helpful too.