As Deshanna McGuire, left, of Nashville watches, Mary Katherine Beshears of Franklin, Tennessee, tries to keep their marshmallow tower from falling during the “Marshmallow Tower Challenge” at the Expanding Your Horizons in Math and Science conference at MTSU Sept. 20. The workshop took place in the Science Building. McGuire, 12, is a student at Bailey Middle School. Beshears is a Freedom Middle School student. (MTSU photo by News and Media Relations)
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