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LUX. MINDZ Mini Newton's Cradle! ~ Premium Science Kit ~ Traditional Classic Style Swinging Balance Balls for Office Desk and Table Decor & Gifts (3" x 3.75" x 3.5") (Miniature Version)
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track material is easy to work with and cheap. it is called shelf bracket tracks or shelf uprights. I have seen various hardware stores and building supply stores carry it, one company that makes it is Rubbermaid. E5 shelf upright. available at Home Depot, Last time I checked, Lowes does n...
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