Entertaining non-fiction books or retellings of myths and legends that are good for a very advanced reader aged 9.
They do not have to be aimed at children/teens as long as there’s nothing inappropriate (graphic violence, drugs, anything X-rated) and the language isn’t too overly technical.
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Books about the cosmos (like Stephen Hawking’s or Dr Mani Bhaumik’s books) are some of the best non-fiction books I enjoyed around that age.