Mary Ann Horn, a program director at The National Science Foundation and a professor of Mathematical Sciences at Vanderbilt University, will be the keynote speaker for UAH Dr. Karen Ames Memorial Lecture Series on Friday, Oct. 31. Dr. Horn will give the presentation "Challenges Arising in the Study of the Development and Spread of Antibiotic Bacteria," at 2:30 p.m., in the Shelby Center for Science and Technology (room 218). Her visit to the UAH campus is sponsored by the College of Science and the Department of Mathematical Sciences. The talk is free and open to the public. Refreshments will be served at 2:30 p.m., in the Shelby Center for Science and Technology (room 201) suite landing.