Sperm competition, ring of fire and the late heavy bombardment

In this episode of Science with Dr. Karl, Zoe Kean, the author of "Why We Like This," dives into a range of fascinating evolutionary topics. They explore the unexpected sleeping habits and walking skills of epaulette sharks, uncover why chilies cause a burning sensation (and why it lingers during elimination), and discuss the ongoing debate about human monogamy and the varying testicle sizes across species. The conversation also highlights the surprising evolutionary role of the appendix, examines why human shins are sensitive yet lack padding, and addresses the troubling trend of declining global fertility rates. Plus, listeners are invited to consider what question they would pose to Charles Darwin if given the opportunity.