Bo Xia is a Junior Fellow at Harvard and a Principal Investigator at the Broad Institute. During his PhD with Itai, he suffered a painful tailbone injury that led to an obsession with this vestigial organ and its origins in human evolution. In this out-of-the-ordinary episode, we talk about this specific science project: how did Bo, with Itai’s help, discover the mutation that let us lose our tail?For more information on Night Science, visit https://www.biomedcentral.com/collections/night-science .