... I still take my slide rule out of its dusty box occasionally and AMAZE my sons and grandchildren - "you did what?!!!"
Still carry a small circular version almost daily - to prove that the Supermarket is trying to screw me with the " Specials ". iPhone ? Wot's that ?
Slide Rule ?? there's posh for you. Once had a Flt. Eng. who sat there in flight completing his log with a Chinese Abacus.
Knew how to use it, too.
( sorry, thought it was about time for a short break )