Uncle Norm finds Alanna and Kevin in the Workshop, squinting through a magnifying glass at small maple trees. He wants to know when they can get sap: bean seeds can grow as high as the tool shed in one summer, so why not a baby tree? The Rads explain that we measure a bean's growth in weeks and months, and Uncle Norm's growth in years and decades, but trees grow more slowly: over decades, centuries, and sometimes even millennia. They visit a sugar bush to find out more.

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

Decade, Century, and Millenium --(8:21) -- Art with Math -- (5:11) -- Rings -- (1:23).