What is the fine-grained topic of the following text: The high­est rated epi­sodes by our ad­vi­sory group were, in or­der, Tara Mac Au­lay on the au­dac­ity to fix things, Dr Spencer Green­berg on sci­en­tifi­cally solv­ing ev­ery­day ques­tions, with a tie for third place be­tween Es­ti­mat­ing the un­know­able with James Snow­den and David Rood­man on be­com­ing a world-class re­searcher. Only return the topic.
Highest rated podcast episodes discussed by an advisory group.