Alchemical Emblems, Occult Diagrams, and Memory Arts: Alchemy Symbols
Sacred Geometry and Symbology
Wikijunior:How Things Work/The Six Simple Machines - Wikibooks, open books for an open world
Ceramic Stirling Engine
off the Grid
Interactive Notebook Levers- can also be used for angles
Classical | Modern Physics
P.S.- Colors that Inspire...
Pascal's triangle - a great number triangle whose entries are coefficients of a binomial expansion
Fabulous ways to add some science decor to your classroom!