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Becky Ripley and Emily Knight examine the naked mole rat, a saber-toothed sausage of a rodent, which seems to defy the mammalian laws of aging. It lives way longer than what is expected of a rodent and is now the focus for much medical research as scientists try to understand more about their aging process in the name of human life extension.

Of course, we all want to age slower and live longer, but does that mean we should continually strive to extend human life expectancy forever and always? Beyond the ethics, there's also some big philosophical questions. How does a longer life span affect our sense of 'self'? And does living longer solve the problem of death?

Featuring Dr Rochelle Buffenstein, Senior Principal Investigator at Calico Life Sciences, and Julian Baggini, philosopher, journalist and author.