Explore the future of clean energy in this 1 hour 25 minute Stanford Physics lecture by Professor Steven Cowley, delivered as the 2025 Robert Hofstadter Memorial Lecture. Delve into the fundamental questions surrounding fusion energy - examining why it's crucial for our energy future, how scientists are working to achieve sustainable fusion reactions, and when we might realistically expect fusion power to contribute to the global energy grid. Learn about the scientific principles, technological challenges, and recent breakthroughs in this cutting-edge field that promises virtually limitless clean energy.