← Back

December 19, 2011

#992: Mnemonics


XKCD Presents: Some New Science Mnemonics

((Pattern goes:



Traditional mnemonic

Contents of frame

New mnemonics))

Order of Operations

Parentheses, Exponents, Division & Multiplication, Addition & Subtraction

Traditional: Please Excuse My Dear Aunt Sally

[[Person having a shark delivered to his laptop]]

Please Email My Dad A Shark


People Expect More Drugs And Sex

SI Prefixes

Big: Kilo, Mega, Giga, Tera, Peta, Exa, Zetta, Yotta

Milli, Micro, Nano, Pico, Femto, Atto, Zepto, Yocto

[[Graph of the declining profits of the Zune]]

[[Karl Marx delivering a number of zeppelins to a bunch of confused proletariats]]

Big: Karl Marx Gave The Proletariat Eleven Zeppelins, Yo

Small: Microsoft Made No Profit From Anyone’s Zunes, Yo


Kingdom, Phylum, Class, Order, Family, Genus, Species

Traditional: King Philip Came Over For Good Sex

Katy Perry: I’m not sure who doubts this, really.

Katy Perry Claims Orgasms Feel Good Sometimes


Kernel Panics Crash Our Family Game System.

Geologic Periods

(Precambrian), Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous, Paleogene, Neogene

Traditional: [I never learned one]

[[A month’s set of birth control pills]]

PolyCystic Ovarian Syndrome Does Cause Problems That Judicious Contraceptives Partially Negate

Resistor Color Codes

Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Gray, White

Traditional: [none I care for]

[[Glenn Beck holding the traditional “Nanobot Vaccine Chemtrail 9

11” sign]]

“Big Brother Reptilian Overlords”, yelled Glenn, “Brainwashing Via Ground water!!”


Be Bold, Respect Others; You’ll Gradually Become Versatile, Great Wikipedians!


Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

Traditional: My Very Excellent Mother Just Served Us Nachos

[[A pregnant Mary attempting to explain things to an incredulous Joseph]]

Mary’s “Virgin” Explanation Made Joseph Suspect Upstairs Neighbor.