Hello, I have been reading through the online allaboutcircuits book and I was just wondering about one thing in the electric safety section. The book says that two humans would be shocked if they were to both touch an ungrounded circuit. I would like to know if this is true ONLY if they touch points that are electrically uncommon or if it is true regardless of the disparity between the voltages of the points in the circuit that they come into contact with. Thanks to any reply!