 That was student reporter Cassidy Kanner-Gomes. You can hear the full segment on the podcast TBH from KALW. It was edited by Sarah Lai Sterland. For Philosophy Talk, I'm Holly J. McDede. Thanks for that great report, Holly and Cassidy. I'm Josh Landy. With me is my Stanford colleague, Blakey Vermeule. And today we're asking, what is gender?