Without saying your age, what's something from your childhood that a younger person wouldn't understand?

[Thudlow_Boink]

@Bonum_Legatum

I remember cheap pocket-sized calculating “machines” stamped out of steel which had strips of numbers running up and down, with sawteeth on one edge of each strip.

I don’t recognize what you’re describing; but I do remember the plastic clicker devices that you could take to the store with you to keep track of how much $ worth of merchandise you were buying.