Explore behavioral economics through a thought-provoking TED talk that examines why society struggles to implement known solutions for pressing social issues. Delve into MacArthur winner Sendhil Mullainathan's insights on challenges like reducing child deaths from diarrhea, preventing diabetes-related blindness, and implementing solar-cell technology. Discover the hidden barriers preventing effective action and learn how small "nudges" can lead to significant societal improvements in this 21-minute presentation.