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If you want to choose a career that helps other people effectively, which should you pick? Medicine? Research? Non-profit? The answers may not be as straightforward as you think. This episode of Rationally Speaking features special guest Benjamin Todd, the co-founder and executive director of 80,000 Hours, an organization devoted to helping people choose career paths to do good better. Ben, Massimo and Julia debate the heuristics that should go into career choice, utilitarianism vs. virtue ethics, and what exactly we mean by "doing good."

Our guest Holden Karnofsky joins us to discuss Givewell, the nonprofit organization he founded. Givewell is devoted to investigating charities and NGOs to determine how much of an impact they’re having. You could call it “evidence-based philanthropy.” He discusses how Givewell evaluates charities, and what the research has to say about various controversies as well as the conventional wisdom in the nonprofit world: Can large charities be efficient? Is the percentage of the donation that goes to expenses really a useful metric? Should we focus on problems closer to home instead of giving to foreign countries? Do microfinance NGOs like Kiva or Grameen Bank live up to their claims? And should or can charities be evaluated objectively?

Few philosophers have as wide of an impact on the general public as ethicist Peter Singer, this week's guest on Rationally Speaking podcast. Singer's utilitarian arguments about how we should treat animals, why we have a moral obligation to give to charity, whether infants should count as "people," and more have won him widespread fame -- and notoriety -- over the last few decades, and launched multiple movements. Tune in to hear his discussion with Massimo and Julia about why he's a utilitarian, and how his views of utilitarianism have recently changed (and find out how he influenced Massimo's life years ago).