In this science communication project, I developed the content for and designed a visual aid for Shopping Trolley Secrets - an exhibition at We the Curious, Bristol. Shopping Trolley Secrets explores connections between novel digital data like shopping data, and its potential uses for public research. The aim of the visual aid is help visitors understand how digital data could be used for public research, and provoke a conversation around issues such as data donation, privacy and the ethics of data sharing among visitors.