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The most basic, stable system involving more than one electron is the
Helium atom. It occurs to me that its ground state is a pointed
illustration of how quantum mechanics can over-ride Maxwellian repulsion
of like charges. In the (singlet) helium ground state the spatial wave
functions of the two electrons are identical - they are "on top of each
other" (they have opposite spins to satisfy Pauli).
-Bob