Yookidoo - Spin 'N' Sort Water GearA Water Gear Toy That Supports Stem By Introducing Children To Sorting, Constructing And Putting Physics & Engineering Into Play. Promotes Problem Solving And Reasoning As Children Create Moving Experiments With Spinning Colourful Action. Promotes Problem Solving And Reasoning As Children Create Moving Experiments With Spinning Colourful Action. Spinning Sorter Teaches How Gears Work: Spinning One Gear Will Spin The Next (Engineering). Through Put &