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Natural history

Purple Martins feasting on saguaro

Didn’t do much working in the wash this summer, but it was nice to see the Martins back again at their usual spot.

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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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