Explore the fundamental principles of scale invariance in biological systems through this seminar by William Bialek from Princeton University. Delve into how physical laws and scaling relationships govern living organisms across different size scales, from molecular to organismal levels. Examine the mathematical frameworks and theoretical approaches used to understand how biological structures and functions remain consistent or predictably change across various scales. Discover the implications of scale invariance for understanding evolutionary constraints, metabolic scaling, neural networks, and other biological phenomena. Learn about the intersection of physics and biology through concrete examples and theoretical models that demonstrate how scale-invariant properties emerge in living systems. Gain insights into current research methodologies and experimental approaches used to test scaling theories in biological contexts.