Pith Ball Electroscope Research Lab Used to trace the invisible

Used to trace the invisible shape of magnetic fields

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

Heavy-duty 500-piece teacher molecular model set with 230 atoms and 270 bonds

Fullerene C60 kit with 60 atoms and 90 bonds for building the spherical cage structure characteristic of fullerene carbon allotropes

5 inches thick

Pith Ball Electroscope Research Lab Used to trace the invisibleTwo pith balls suspended on unspun silk from a brass pillar, fanning apart visibly when a charged rod approaches to demonstrate electrostatic repulsion and induction.