Lis Costa, Chief of Innovation and Partnerships at the Behavioural Insights Team, joins High Signal to explore how behavioral science is reshaping public policy, digital platforms, and machine learning.She explains how defaults influence behavior at scale, why personalization and chatbots are unlocking new kinds of interventions, and what happens when AI systems meet real-world complexity. We also discuss the limits of nudging, the promise of boosting, and why building for human decision-making requires more than just good models.LINKSThe Behavioral Insights Team (https://www.bi.team/)Lis Costa on LinkedIn (https://uk.linkedin.com/in/elisabeth-costa-6a5b35248)High Signal podcast (https://high-signal.delphina.ai/)Delphina's Newsletter (https://delphinaai.substack.com/)