A new book from University of Illinois Urbana-Champaign anthropology professor Kathryn Clancy (EIRH) takes an unflinching look at the many ways humans have struggled – and often failed – to understand one of the greatest mysteries of human biology: menstruation.

A new analysis of reports from more than 35,000 people offers the most comprehensive assessment so far of menstrual changes experienced by pre- and post-menopausal individuals in the first two weeks after receiving the COVID-19 vaccine. Published in the journal Science Advances, the study adds to the evidence that significant numbers of people experience this unexpected side effect.