Defining effective altruism ... Rob explains the meaning of ‘80,000 Hours’ ... Should young people dedicate their careers to fighting climate change? ... The Apocalypse Aversion Project ... How cognitive biases fuel tribalism ... Bob: We need a psychological revolution ... Are external threats the best way to bring people together? ... The balance between surveillance and public safety ... Bob: Let's retire the word 'apologist' ... Making rationality cool ... Rob challenges Bob to find flaws in "The Moral Animal" ...