From the BAMA website:

"Got Math? We Did, Long Before Europeans Arrived!

BAMA generally specializes in sharing modern views of mathematics, but for this presentation there will be a break from that tradition, in that some very old but remarkably sophisticated views of mathematics will be shared. The presentation will begin with a short excursion into Algonkian attitudes toward number as shown in Ojibwe number words. However, the centerpiece of the discussion will be some of the less well-known features of classical Central American mathematics, e.g., the number theory involved in the misunderstood "end of the world" computation attributed to the Maya that led to predictions of a doomsday earlier in this decade. The talk will be interactive, in that the audience will have the opportunity to try to solve (in groups) some real problems that appear on monuments of the classical Mayan era (and, if there is time, figure out when the world was supposed to end).

* Bob Megginson *is Arthur F. Thurnau Professor of Mathematics at the University of Michigan in Ann Arbor, where he has been since 1992 except for a two-year term as Deputy Director of the Mathematical Sciences Research Institute in Berkeley. Recognitions for his nationally-known work to increase the participation of underrepresented minorities in mathematics include the U.S. Presidential Award for Excellence in Science, Mathematics, and Engineering Mentoring, as well as the highest service awards of the Mathematical Association of America and the American Indian Science and Engineering Society. He has been named to the Native American Science and Engineering Wall of Fame at Southwestern Indian Polytechnic Institute, and portrayed in 100 Native Americans Who Shaped American History by Bonnie Juettner."