Ann Valentine, professor and chair of the chemistry department at Temple University, will deliver the 2023 Henry J. and Linda C. Pownall Lecture in Chemistry at Wilkes University at 7 p.m. on Wednesday, Oct. 18, in Stark Learning Center 105. The lecture, “Exploring a Role for Titanium in Biochemistry,” is free and open to the public. For more information, visit news.wilkes.edu.