Have you ever wondered how people counted to 100 before modern numbers were invented? In the How Do series, readers are invited to guess and then explore the science behind the right answers. A basic... This description may be from another edition of this product.
ThriftBooks sells millions of used books at the lowest
everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We
deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15.
ThriftBooks.com. Read more. Spend less.