AMHERST, Mass. - Ayele Bekerie of the African Studies and Research Center at Cornell University will give a lecture, "The Ethiopian Number System and its Relation to Education," on Tues., May 5 at 4 p.m. in the Gunness conference room of Marcus Hall at the University of Massachusetts. The lecture is sponsored by the UMass Science, Technology, Engineering and Mathematics (STEM) Education Institute. The program is free and open to the public. Refreshments will be served before the talk, at 3:45 p.m.