I was watching the weather on BBC yesterday and it struck me that the one thing that I learned in secondary school (K12 for Americans) that I have used the most over the intervening 29 years is the ability to read pressure charts. I’ve probably used this weekly (at least) since learning it in geography class aged 15. Along with the names of the chemical elements, reading weather charts is the only thing that I still use. And I only use the former for naming servers and volumes!