If all of the cells in your body get replaced every ten years, will you still be the same person a decade from now? If all of your memories get erased today, will you still be the same person tomorrow? In this episode we take a look at tough questions about personal identity and the nature of the self. We review the work of some of the great philosophers who have tackled these problems, including John Locke, Thomas Reid and Derek Parfit. Along the way we also learn a lot about Star Trek’s greatest hairstylist, read some poems about fish and learn how to pronounce teletransportation with an Australian accent.