Adventure experience Children Book Writing Assistant

I'm seeking a writing assistant who can help me pen a children's book for 9-12-year-olds. The book will be educational, covering subjects like Science, History, and Mathematics, and also incorporating elements of adventure and fantasy.

Ideal Skills:
- Experience with children's literature
- Strong understanding of educational content
- Creative writing skills
- Familiarity with Science, History, and Mathematics
- Ability to weave adventure and fantasy elements
- Understanding of age-appropriate language and concepts