I write about people I think are interesting, and then I discuss it with my editor, and she decides if she thinks it will be interesting to children as well. If I have no great interest in the subject, I find the work to be terribly boring. And if I find the person interesting, I love the research part and, by extension, the writing as well.

I love math and was a math teacher for many years, so it was fun for me to write several math books, including 'Fraction Fun,' 'Calculator Riddles,' and 'Shape Up!' 'Fun with Triangles and Other Polygons.'

I love to write. I used to be a math teacher. And I like the idea that other people could write about the same subjects, but no one would write it just the way I do. It's very individual: a child could write the same story as somebody else, but it wouldn't come out the same.

My first biography was 'Our Golda: The Life of Golda Meir.' To research that book, I bought a 1905 set of encyclopedias. Those books told me what each of the places Golda Meir lived in were like when she lived there.