Some contended an absolute minimum temperature occurred within earth (as one of the four so-called elements), others within water, others air, and some more recently within nitre.
Sections have been discarded when no longer applicable (as laundry, shorthand) but others are adopted and integrated (as youth creative arts and crafts and flower arranging).
Usually referred to as a teachers' union its membership also includes college faculty, public school custodians, bus drivers, and paraprofessionals, among others.