Einstein’s Relativity: A Primer. Presented by Mike Lawrence, Ed.D. Rensselaerville Library. Four Thursday evenings, 7 to 8 p.m. August 3, 17, 24, 31. This four-part presentation is a beginner’s guide to the background, development, and consequences of the major ideas in Special and General Relativity. No math background is required (but a little can be helpful).