Look It Up

On this week's episode: do school district boundaries follow the lines suggested by a Voronoi diagram? What are the origins of the Prairie Home Companion song about rhubarb pie? Are some types of blankets warmer than others?   0:42 - Voronoi school districts 3:09 - Rhubarb pie 7:06 - Shorts 7:40 - Blankets 9:33 - Sources 10:05 - Lev Theremin playing the theremin   Sources: supplementary images for "Voronoi school districts," bit.ly/liuschools1. School district boundaries, bit.ly/liuschools2. Prairie Home Companion, prairiehome.org. A book about Lawrence Tibbett, bit.ly/liulawrence.