But knowing the evolution is very helpful to me. When you
consider the relationship of the behavior of electrons and
"electron holes" in semiconductors and compare it to aligning
magnetic fields... it really helps in comprehending "how it
works" from several different viewpoints. electrons and electron
holes analogize to balls in cups moving around and aligning
magnetic fields analogizes to changing water flow direction. Yet
even within semiconductor lingo, the "source/drain" metaphor
remains.* Whole thing is fascinating honestly.