Make: Asks is a weekly column where we ask you, our readers, for responses to maker-related questions. We hope the column sparks interesting conversation and is a way for us to get to know more about each other.

Back in school they taught us “My very excellent mother just served us nine pizzas,” to remember the order of the planets from the sun (though now we have to remove Pluto of course).

This week’s question: What scientific or technical mnemonics have you retained, and do you use any on a regular basis?

Post your responses in the comments section.