Science in the sandbox and "wonder" ful and similar items

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Your satisfaction is guaranteed! All of our book store listings have a 15-day return privilege. We try to describe and image our items, as accurately as possible, but because of the limitations of the Internet we understand that it is difficult for you to determine the condition or nature of our items listed. WE WANT YOU TO BE HAPPY WITH YOUR PURCHASE! You may return this item(s) for any reason (as long as the item has not been materially changed or modified). We will refund payment.