Desktop Newton's Cradle $6.79 Shipped
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Updated. Shop4Tech.com drops the Desktop Newton's Cradle from $14.99 to $7.99. Better yet, code FF15 cuts it to $6.79. With free shipping, this matches the all-time low. The classic desktop piece that displays the conservation of energy features five metal balls and makes a nice gift for your favorite desk jockey. There is no sales tax (except CA). (Instructions »)