{ "item_title" : "Pendulums", "item_author" : [" Peg Marson", "Ronald Jay Marson "], "item_description" : "Time pendulums, count cycles, measure lengths, graph data, predict frequency, calculate ratios, and even discover the square root of two. Couple pendulums with a rubber band to watch the energy flow back and forth. Join four pendulums with a raft of heavy books and watch the complex harmonic motion draw a seashell pattern. Great science, great math, great art, all done with simple materials.", "item_img_path" : "https://covers1.booksamillion.com/covers/bam/0/94/100/855/094100855X_b.jpg", "price_data" : { "retail_price" : "25.95", "online_price" : "25.95", "our_price" : "25.95", "club_price" : "25.95", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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