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Book Description paperback. Condition: New. Ship out in 2 business day, And Fast shipping, Free Tracking number will be provided after the shipment.Paperback. Pub Date :2013-05-01 Pages: 122 Language: Chinese Publisher: Popular Science Press pentagons can tile floor covered without gaps do ? Do you know what the balance hidden secret? Mass fraction of 50% with saline something ? Do you want to learn how to use the police power of logic to find the real perpetrators ? These are how much fun math problem! Courts to understand the mathematical life of scientific principles it ! It's interesting science court Mathematics court ( 2 ) : Venice.Four Satisfaction guaranteed,or money back. Seller Inventory # RV003468