I have a mystery. Between ground and my metal desk (I thought I had grounded) there exists 5.44V of 60Hz AC. I have unplugged everything on the desk and from mains ground to my desk there is still roughly 5.44v between the two. My voltmeter has a very high impedance so it is possible that the desk is able to couple power into the air or what is going on? I'm wondering if I have current in my ground wiring from a bad neutral somewhere else in the house...