First Principles of physics,
ie. mechanical advantage, newtonian, boole (?) gas/liquid phase, etc.

properties of materials (identity by feel, sound, etc) understanding
classic properties of materials allows identification w/ our senses
properties of metals (ditto)
other elements
electrochemical reactions based upon periodic tables "groups"


divorced from technology
as a valid filter through which to view the world.
as transferable and understandable
(and trustworthy)