Erin Connelly Philadelphia, Pennsylvania, United States “Urine Wheel,” Almanack, Free Library of Philadelphia – The Rosenbach, MS 1004/29, fol. 9 C (York, England, 1364), courtesy of Bibliotheca Philadelphiensis. OPenn Repository Great disparities in wealth and differences in access to healthcare between the top and bottom of society are hardly new experiences in human history.1-4 Even…