Yeah my friend was saying HAARP is the only other possibility besides God. But realizing the wattage it would take to do that all over the world, it would be pretty much impossible. And personally, I don't think it's the electrical grid and don't think it's the Cell Phone grid. Maybe for the hums your article spoke of, but not the sounds in the video's I posted.
Also I remembered this after writing you yesterday. Listen to these sounds and see what you think. Science knows exactly what these sounds are.
Those are the sounds planets make, and they were recorded from space. And as you can see, the sounds are from NASA. And I would bet they raised the pitch higher, like they do with earthquake sounds. So the real sounds are a lot lower. Also you notice how they are all harmonic sounds? Just like the sounds heard in the video's.