Physics of Life podcast explores the interdisciplinary nature of physics and life. Guests delve into topics like the limits of the brain, compression in complexity science, energy budgets in the brain, dynamics of living systems, scaling laws in organisms, and the hidden order in nature.
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Quick takeaways
Compression is a crucial tool for understanding complex systems, as seen in the brain's use of shorthand and energy efficiency.
Scaling laws in biology reveal underlying principles of growth and energy use, with metabolism and sleep playing significant roles.
Deep dives
The Brain, Energy, and Compression
Vijay Sabramanian, a theoretical physicist, discusses how compression, seen in complex systems, helps us understand the world. He uses the story of Funes the Memoirias to explain why we use shorthand to understand complex things. In biology, compression is crucial due to the brain's limited capacity. The brain uses energy efficiently to perform various computations, but it has physical limits that constrain its abilities. Vijay highlights that the brain's energetic efficiency is a fascinating aspect of its functioning.
Scaling Laws and Limits in Life
Jeffrey West, a theoretical physicist, explores the concept of scaling laws in life. Scaling laws show that patterns emerge when comparing organ functions and sizes across different animals. These laws do not result in a simple linear relationship, but rather reveal underlying principles governing growth and energy use. West's investigations indicate that metabolism and sleep are crucial factors related to scaling laws. He also discusses how the repair mechanisms in our bodies and the brain's energy consumption contribute to the constraints and limits on human lifespan.
Connecting Physics and Life
The podcast episode delves into the connection between physics and life, emphasizing that physics is a fundamental part of understanding the natural world. Vijay Sabramanian discusses the interdisciplinary nature of research and the importance of incorporating physics into biology to make progress and enhance predictive abilities in understanding life processes. Jeffrey West demonstrates how physics, specifically scaling laws, applies to biological systems and unveils underlying regularities in seemingly chaotic phenomena. The episode concludes with a reflection on the profound experience of perceiving mathematical equations governing the complexities of life in the natural world.
“The Physical Effects of Learning” preprint published in biorxiv
“Unraveling why we sleep: Quantitative analysis reveals abrupt transition from neural reorganization to repair in early development” in Science Advances (September 18, 2020) DOI: 10.1126/sciadv.aba0398
“The Scales That Limit: The Physical Boundaries of Evolution” in Frontiers in Ecology and Evolution (August 7, 2019) doi.org/10.3389/fevo.2019.00242
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