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| Best Sellers Rank | #2,215,608 in Books ( See Top 100 in Books ) #1,764 in Children's Math Books (Books) #2,437 in Children's How Things Work Books (Books) |
| Customer Reviews | 4.8 4.8 out of 5 stars (82) |
| Dimensions | 8.63 x 0.31 x 10.91 inches |
| Edition | Revised |
| Grade level | 2 - 5 |
| ISBN-10 | 1465443878 |
| ISBN-13 | 978-1465443878 |
| Item Weight | 14.4 ounces |
| Language | English |
| Part of series | Big Questions |
| Print length | 96 pages |
| Publication date | January 19, 2016 |
| Publisher | DK Children |
| Reading age | 7 - 10 years |
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