Abstract: A balance assembly having an assembled state and an unassembled state. The balance assembly comprises a base configured to receive a portion of a like base in a nesting relation in an unassembled state of the balance assembly, a pedestal coupled to the base in an assembled state of the balance assembly, the pedestal configured to receive a portion of a like pedestal in a nesting relation in the unassembled state, a lever removably and pivotably coupled to the pedestal about a fulcrum centered along a length of the lever in the assembled state, the lever configured to receive a portion of a like lever in a nesting relation in the unassembled state, and a pair of containers removably supported at opposite ends of the lever in the assembled state, each container configured to receive a portion of a like container in a nesting relation in the unassembled state.

Abstract: An educational clock that includes a base, a minute number line chain including a plurality of minute links pivotably connected together, and an hour number line chain including a plurality of hour links pivotably connected together. The minute number line chain is adjustable between an annular shape configured to removably couple to the base and a linear shape. The hour number line chain is adjustable between an annular shape configured to removably couple to the base concentrically with the minute number line chain and a linear shape. The minute number line chain and the hour number line chain are approximately the same length when each is in its linear shape.