Mnemonics For Science

The Planets:

My Very Easy Method Just Speed Up Naming (Planets)

Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune (Pluto)

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First five organic chemistry compounds (let`s go with alkanes)
Most Elephants Prefer Big Peanuts
Methane Ethane Propane Butane Pentane

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7 colours of the rainbow
Richard Of York Gave Battle In Vain
Red Orange Yellow Green Blue Indigo Violet

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The electromagnetic spectrum
Remember Monkeys In Very Useful X-Ray Groups
Radio waves Microwaves Infrared Visible light Ultraviolet X-Rays Gamma rays

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Linnaean Classification
Kind People Constantly Offer Flipping Good Sandwiches
Kingdom Phylum Class Order Family Genus Species