Bad vibrations: what's the evidence for geopathic stress?

Some people think that vibrations rising up out of the earth can cause anything from road rage to cancer, but where's the evidence for such an extraordinary claim?

I have a confession to make. For a brief time when I was about ten years old, I thought I could move a quartz crystal with the power of my mind. I was on holiday in North Wales, and I'd got it from a gift shop from a small-town attraction whose name I can no longer recall. Quartz crystals have a certain sort of captivating beauty about them, and this one was no exception; it was attached to a length of leather cord, and looked like it would fit right at home as a trinket from an epic fantasy novel. When I got back to the caravan we were staying with, I was holding it, staring at it, when it seemed to move for no apparent reason. Curious, and ever-hopeful that something magical would happen to make the holiday something other than banal, I wondered whether I could make it happen again. So I held the top of the cord as still as I could, and tried to imagine the crystal swinging in a circle. And it did. For a brief moment, anyway. I think.

Obviously, I don't have any magical psychic powers - no one does. What I was experiencing was the ideomotor effect - I was simply making the swinging motion myself, without realising it. I didn't know the term when I was ten years old, but after repeating the experiment a few times, and not getting a consistent swing, I nevertheless came to the same conclusion that nothing out of the ordinary was happening. And so the holiday plodded on.