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Yellow butterfly

The rain has brought out the insects. Dragonflies are patrolling the skies, and butterflies are everywhere. In addition to this yellow fellow, there are

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About Bill McCallum

I was born in Australia and came to the United States to pursue a Ph. D. in mathematics at Harvard University, met my wife, and never went back. I am a professor at the University of Arizona, working in number theory and mathematics education.

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