In this series, I’m compiling some of the quips and one-liners that I’ll use with my students to hopefully make my lessons more memorable for them.

Every once in a while, when I’m expecting my students to use a formula which is so long that I can’t reasonably expect my students to memorize it, I’ll let my students bring a 3-by-5 card to class. When I tell them this, I tell them the ground rules:

- The units of the card should be in inches (as opposed to 3 meters-by-5 meters)
- The card can have handwritten notes.
- No magnifying glasses.

I then related an amazing anecdote that I heard when I was a teenager: for his German final, one of my acquaintances somehow used his Apple IIe computer and his Epson printer to somehow print in microfiche font. He got *all of his notes from his thick German notebook* onto one side of a 3-by-5 card and half of the other side, leaving half of the back side blank.

Amazing.

Presumably he brought a scanning electron microscope to class so that he could read his notecard.

Anyway, I tell my students, no magnifying glasses are permitted on exams.

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