David A. Adler

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.'

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.