Red Molecular Model Atom, 2cm, 2 Holes at 90°, 10-Pack Material_Wood transmitting light end-to-end via total

transmitting light end-to-end via total internal reflection to give a tabletop analogue of a fiber-optic cable

and iron — for water-displacement and direct-measurement comparisons of material density

Children use all 5 senses

Built for bulk liquid measurement

Life-size hand-painted spinal cord model shows cervical through sacral segments with emerging nerve roots

Red Molecular Model Atom, 2cm, 2 Holes at 90°, 10-Pack Material_Wood transmitting light end-to-end via totalBent two hole red atoms at a 90 degree angle in a 10 pack at 2cm diameter, conventional stand ins for oxygen centers in water and alcohol like structures.