Here is an interesting documentary on the effects of EMF radiation in our environment, if you have a spare hour and a half this is well worth watching and quite frightening. Note they talk about Schumann resonance here, you may know also that Blushield does a whole lot more than just reproduce the Schumann resonance and they are talking about one aspect of the earths magnetic field.

https://www.youtube.com/watch?v=-6n-fIHGia8

Yes 7.83 Hz does do something but it does only for a limited number of people and in nature there are so many more frequencies than just the predominant 7.83 Hz. We have known this for a long time and taken that into account when designing the Blushield.

I wonder what would happen to the bees if we placed a Blushield in each hive? A test we should be sure to look at in the near future.