Faraday's Butterfly Net Type_Round End verifying conservation of momentum in

verifying conservation of momentum in two dimensions for mechanics-unit investigations

Glass-faced plotting compass in an aluminum case with a dial marked in principal points

this three-dimensional Paramecium sectional model reveals internal structure and ciliate organization for microbiology teaching

demonstrating mechanical-to-electrical energy conversion as the crank lights the bulb

Faraday's Butterfly Net Type_Round End verifying conservation of momentum inDemonstrates that charge resides only on the outer surface of a conductor by inverting the charged net inside out and showing the charge transferring to the new outside layer.