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I have two nieces who are currently 3 & 5 years old, and I bought this book for them to share (along with "She Persisted Around The World") at Christmas. The drawings are appealing and catch their attention, and the writing is challenging enough that they'll be able to re-read the book until they're 10, but simple enough that they can still enjoy the book now.
This book is written for 8-year-olds and I was wondering how would the biography of a judge be of interest to children that young. It turns out that this is a very fascinating modern day story about a modern day hero, and stories about heroes are just what children enjoy. It is probably suitable to even younger children who might require their parents to read to them - but guess what? I think the parents would love it.