Uncle Norm needs to find the perfect sized foil ball to fit into the hole atop his all-purpose invention machine, the Inventonator -one that will spark its thoughts! The Rads visit a bubble expert who knows everything there is to know about measuring the circumference of spheres!

Originally released by GAPC Entertainment, Inc., 2013. Streaming video file encoded with permission for digital streaming by Infobase on October 13, 2014.

Circumference --(7:54) -- Art with Math -- (5:38).