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Colm Mulcahy is a mathemagician, a professor at Spelman College, and a visiting professor  at American University.

He is widely known as an inventor of astonishing card tricks based on mathematics, and for his writing and presentations on the topic.  In particular, he is the author of ...
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The new CRC Press book
Mathematical Card Magic

Card Colm: A Mathematical
Association of America Blog

A Huffington Post Blog

He tweets as @CardColm.