The Impossiball, composed of two hemispheres of different materials - a high bounce material and a dense foam - does not behave like your average ball.

Lesa Rohrer has developed a series of hands-on activities featuring the Impossiball and investigating density, mass and volume. Students are also challenged to use their skills of observation, measurement, and implementing the scientific method.

Includes one Impossiball (5cm dia.), two large spheres (10cm dia.), two small spheres (5cm dia.), and two cubes (3cm3), each in foam and high bounce material. Instructions included.