michael olson wrote:
> Jerry,
> the same day I was going to post on the idea of trading pmm -perpetual
> motion machine- for ppm perpetual power machine, you posted a letter
> with ppm in it. Dupont also has an add in scientific American(this
> month) where they use ppm as in chemical ppm. Interesting as they show
> the quarter wave theory, (ie resonence) in the background of their
> image. My question- what is ppm?
> Sincerly,
> Michael