Take an appealingly illustrated fun test of your perceptual ability, math smarts, and knowledge combinations and probabilities. See how fast your eyes can discern the one sulking face nearly hidden in a large group of smiling "Spikeheads." Figure out how many different shapes went into creating two tessellation patterns. It takes mental gymnastics to rearrange a human tower of 36 red and blue acrobats so that they fulfill a set of rules about where they stand and who they stand next to. Calculate how many different ways the eight Knights of the Round Table can be seated without anyone having the same two neighbors more than once. There's also fascinating background on the theoretical principles that underlie the solutions

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Founded in 1973, with a shop in downtown Amherst from July 1975 until July of 2009, we are now an online only bookshop. We accept orders by phone or email only. We accept personal check, and paypal. Reasonable offers considered.

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Valley Books
MA, U.S.A.

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Terms of Sale

Please designate shipping preference. Media mail is 4.25 for average size hardbacks and paperbacks in the U.S. Delivery confirmation is included in the price. $1.00 ea. addit. book. Oversized books are charged at exact cost. Flat-rate Priority rate is $6.95, including delivery confirmation. Oversized books shipped priority depend on weight and zone and will be charged at exact cost. Foreign postage, to most countries, is 32.95 for average size hardbacks, sent First Class International rate.. Can...

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Shipping Terms

Preset shipping cost is based on average hardcover size and weight. Over-sized or unusually heavy books may require additional postage. Delivery confirmation free with every order. We describe accurately and pack carefully. We ship USPS unless another service is requested. We ship within 48 hours of receipt of order, often within 24 hours. We ship worldwide. Books are returnable within 7 days of receipt. ALL BOOKS ARE SHIPPED WITH TRACKING NUMBERS, TRACEABLE AT THE USPS WEBSITE. PLEASE REQUEST TRACKING NUMBERS. ANY CLAIMS OF NON-DELIVERY WILL BE CHALLENGED AGAINST THE TRACKING INFORMAITON PROVIDED BY THE USPS.

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Shipping rates within U.S.A.
Order quantity	5 to 14 business days	3 to 6 business days
First item	US$ 6.00	US$ 10.50

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