Low-Friction Double-Tandem Plastic Pulley, 38 and 50mm Diameter Subcategory_Force and Motion Seventy-times enlarged skin cross section

Seventy-times enlarged skin cross section reveals epidermis

Optically-worked glass double convex lens with a 150mm focal length and 1

3 glass Griffin-form beaker shot glasses hold 3

Shows oxygenated and deoxygenated blood paths between heart chambers and alveolar surfaces through seven hand-painted removable parts designed with medical-professional input

Low-Friction Double-Tandem Plastic Pulley, 38 and 50mm Diameter Subcategory_Force and Motion Seventy-times enlarged skin cross sectionTandem double plastic pulley pairing 38mm and 50mm low friction wheels on an open sided steel frame, eliminating cord threading during setup in compound pulley experiments.