Mudpuppys Little Scientist Board Book Set is comprised of colorfully illustrated portraits of scientists who have made a historical impact on the world. Illustrations by Lydia Ortiz and words by Emily Kleinman introduce children to these important people in history with images that are fun for youngsters and also realistic. The Board Book Set includes 4 mini board books, 8 chunky pages per book, packaged in a slipcase box.- Each Book Size: 4 x 4 x 1″, 10 x 10 x 2.5 cm- 8 Chunky Pages per Book- Slipcase: 4″, 10cm cube- Greyboard contains 90% recycled paper. Printed with nontoxic inks.- Ages 0-5- All Mudpuppy products adhere to CPSIA, ASTM, and CE Safety Regulations