Good stuff BillPa
The earth is connected to the foundation of your home. The earth has natural vibrations Like the Schumann resonance that are constant. Your table or bench acts like an amplifier. Then you have things like the sounds like jet airplanes, helicopters. You also have impacting such as a truck driving by etc... This is constant 24/7/365. Combine that with use and the edges wear.What do you consider "external sources"?
Most people are unaware of the amount of vibrations all around them every day. See if there is a Seismograph located near you and check it out.
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