Junior Craft, Design, and Technology
Up and Down the Hill Wheels and Gears
Why do bicycles have gears? What makes part of a pull-along toy bob up and down?
Narrated by FELICITY HAYES-MCCOY
Producer DAVID TAFT
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Junior Craft, Design, and Technology
Up and Down the Hill Wheels and Gears
Why do bicycles have gears? What makes part of a pull-along toy bob up and down?
Narrated by FELICITY HAYES-MCCOY
Producer DAVID TAFT