Elizabeth Coppock is a linguistics professor at BU. He research focuses on foundational topics in truth, reference, quantification, and measurement in natural language semantics, through the lens of specific empirical puzzles. Recently, one of our group members (Cheng Zhang) expressed interest in Elizabeth's work as it might relate to his own research in programming languages, so we reached out to Elizabeth and asked if she'd be willing to present to the seminar group. (This is one of my favorite things about running the group: when a group member expresses interest in some research paper, we can simply invite the lead author to give a presentation!). Elizabeth graciously agreed and gave one of the best presentations we've had in months, full of fascinating real-world examples of the often surprising ways that we use "per" in the English language, and the underlying mathematical complexity of said usage. This was an enormously fun talk and we really hope you enjoy it as much as we did! And thank you again to Elizabeth for presenting!