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Wisconsin Menger Sponge Project

Mount Mary math professor needs 50,000 business cards.

January 8, 2013 – If anyone has old or unused business cards, Roxanne Back, Ph.D., a math professor at Mount Mary College, will gladly take them off your hands. Dr. Back is spearheading a Wisconsin Menger Sponge Project with several middle and high schools that requires more than 60,000 business cards. A Menger sponge is a geometric object first created in 1926 by mathematician Karl Menger.