Gemara Berachos 30b Thanks go to Artscroll for graciously allowing me to use sections from the Artscroll Gemara.
Tefillin Waves vs. Radio Waves
Reb Eliya Lopian ZT”L once asked a talmid if a radio works ithout being plugged in. The talmid answered, “Yes!” Next, Reb Eliya asked, “If a small crystal is missing,