Measuring the Mass-Radius Relation of White Dwarfs With Wide Binaries by Stefan Arseneau, Vedant Chandra, Hsiang-Chih Hwang, Nadia L. Zakamska, Gautham Adamane Pallathadka, Nicole R. Crumpler, J.J. Hermes, Kareem El-Badry, Hans-Walter Rix, Keivan G. Stassun, Boris T. Gaensicke, Joel R. Brownstein, Sean Morrison