Shape Stacker (Premium) (Made in USA) (Age 1 & Up) - Unpainted Radioactive Ferrofluid was invented by NASA

Ferrofluid was invented by NASA in 1963 (using rocket fuel as the liquid) as a way of ensuring that the rocket fuel otherwise "floating around" inside a tank in a weightless environment could be drawn toward a pump inlet by applying a magnetic field

from counting & early numeracy to arithmetic & logic

The metal inside the sealed glass will spin when exposed to strong light

The glass tritium lamp inside can be broken if dropped onto a hard surface or if the GlowRing receives a hard blow

One straight-forward set of instructions to perform the levitation

Shape Stacker (Premium) (Made in USA) (Age 1 & Up) - Unpainted Radioactive Ferrofluid was invented by NASAExtremely well made and using six different geometric shapes, this gorgeous Shape Stacker introduces 4 key educational concepts for your baby: Shapes Triangle, Square, Pentagon, Hexagon, Octagon, and Circle Shape Names the English name of the shape is clearly engraved on each shape Number of Sides the number of sides are clearly numbered on each shape Patterning the design encourages sorting from smallest to largest size The stacker also helps young