* No mention of coil size or currents used or measured. (300 ohm? what gauge, what inductance, what coil radius) How can they say a "small current'. WTF, what kind of field strength are we talking about. Amps, microamps?
* How can you measure or emit 7Hz with a coil that is a few inches in diameter?
* Weirdly using 7Hz and then talking about 7.83Hz Why wouldn't they try these experiments in all of the Schumann resonance frequencies.