I just read @953 nut's post for 1/1/1975 and saw on the cover of the Popular Mechanics magazine an add for a "scientific" calculator for under $90.
I remember this issue and remember reading about the small battery powered calculator.
It was advertised as "smaller, smarter, and cheaper"...and I had a 110 volt corded one and thought, yeah, I have a "big dumb expensive one"!
I also remember my dad buying one of the "new" <$90 one!
Wow,,,1975......really makes me feel old now!