What’s the biggest lie you were told growing up?

There were many lies, but the biggest one was that any and every job more than “night janitor” would use math constantly, and if you didn’t basically become a mathematician you’d not be able to find employment.

This was a widely-told bit of mendacity. The reality is of course that in 90% of jobs basically no math is ever used, and even in those where it is it’s all automated away. The few that use actual math only use a tiny subset, and often even they don’t understand it all that well.