At one time in the not so far past.
These nails were electricly charged by the Ether,
The electric energy all over the earth witch is still there, all so known as static electricity, the higher you reach in to the sky the stronger it is.
Look at all the old world buildings around the world, most were disastrously razed to the ground in WW1, WWII by bombings so they could put a meter on the supply to the masses .