

That wasn’t so much a “fact” told in school as it was a prediction, and it was true for them. Some people carried pocket calculators, but most people didn’t. Some supermarkets has calculators built into their carts, but most didn’t.
Failing to predict society’s norms in 20 years isn’t the same as teaching a false fact.
Yep, back in the 90s they were in some places. My local supermarket had one like this, except without the annoying ad on the left side.