that study proves that zappers don't kill worms, only "helps" a little. big deal ! would you spend good money for something that just helps a little? that's up to each person.
"Many of the frequencies in that list were provided by R. Rife and John Crane." ha what crap! there are hundreds of frequencies on that list but only about 10 are from Rife. Over the years any yahoo who reported success with a frequency resulted in his frequency added to the list. It is not truly a Rife frequency list.