Books like The Boy Who Loved Math
Deborah Heiligman
The Boy Who Loved Math is 43 pages, about 47 minutes at 250 words a minute.
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Manfish 43 min 
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Odd Boy Out 35 min 
Isaac Newton and His Apple 3.5 h 
Counting on Katherine 44 min Bar height shows length. Estimated at 250 words a minute.