Professor Jerry Bayless will give a demonstration on “How to use a slide rule” from noon-12:50 p.m. Thursday, Feb. 19, in the Meramec-Gasconade Room of the Havener Center. This is an opportunity to learn to use a slide rule and view some “antique” slide rules. The presentation is sponsored by Missouri S&T Archives. For more information, contact Diana Ahmad at 341-4817 or email ahmadd@mst.edu.