One day when I walked into my
high school physics classroom (mid 90's) early and went up to the teacher (retired
army engineer)'s desk to speak to him, I saw what at first appeared to be a
ruler. Upon looking carefully I asked him, "Is that a
slide rule?" After being answered in the affirmative, the teacher then proceeded to give me a quick lesson in
multiplication and
division on it.
Other than watching two high school students "sword fight" with slide rules (I don't know where they got them) in a technical drawing class (the year before the class changed from being a manual drafting course to being a CAD course), I never saw a slide rule again until I found one in my parents' garage one day while helping to clean it out (It became mine). Unlike basically everyone else my age, I know how to use a slide rule, and do so occasionally.