Brian P. Cleary 
"Mrs. Riley Bought Five Itchy Aardvarks" and Other Painless Tricks for Memorizing Science Facts [PDF ebook] 

They say elephants never forget. Once you read this book, neither will you! Brian P. Cleary has tips for tackling all types of tricky science facts. This book is bursting with acrostics, acronyms, poems, songs, and more. Need to keep track of the order of the planets? Mel can help. As in: "Mel’s Very Excited Ma Just Served Us Nachos." How about photosynthesis? Sing a song about it to the tune of "Row, Row, Row Your Boat"! And better yet, you’ll get ideas for how you can create your very own painless memory tricks. Lively illustrations from J. P. Sandy add to the fun of this UNFORGETTABLE series!