4 ms·"This year a semiconductor factory, next year a whole-conductor factory!"by tdsamardzhiev 7y ago"This year a semiconductor factory, next year a whole-conductor factory!"lb1lf 7y ago-Are part-time band leaders semi-conductors?IndrekR 7y agoThe joke is more to the point than one may expect: https://en.wikipedia.org/wiki/Valence_and_conduction_bands https://en.wikipedia.org/wiki/Valence_and_conduction_bands