Acoustics
Interesting Daniel. ELF frequencies have interested me for decades after working closely with Dr. Andrija Puharich for years. I sit here with my Q-Link on and my Clear Wave running from it's central location in the house. I can tell stories that would make serious researchers become more aware of the electro magnetic pollution all around us.
Ever read "The Body Electric" by Robert O. Becker and Gary Selden?
Another interesting book that was given to me by a doctor is "Music and Miracles" by Don Campbell.