  The concepts of phase, group, and front velocities introduced by Sommerfeld
will be reviewed, and applied to superluminal phenomena, with a brief review of
optical experiments that evince superluminal group velocities. We shall discuss
the special case of "instantaneous superluminality" in the case of electrons.
In particular, the charge transfer of electrons through a Fermi sea of
electrons from the interior to the exterior of a normal metal will be discussed
in connection with an ongoing experiment to measure the time it takes for this
charge transfer process to take place in a long aluminum bar, in a
generalization of Faraday's original "ice-pail" experiment. Also, the speed of
the charge transfer of Cooper pairs through a bimetallic superconducting
island, coupled via an input and an output Josephson junctions, will be
discussed.
