Radiolab The Nothing Behind Everything
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Jul 25, 2025 
Join Jim Holt, author of 'Why Does the World Exist?', as he dives into the perplexing nature of reality and matter. He and Robert Krulwich explore the mind-boggling concept that our world may be mostly nothing, challenging what we perceive as solid. The conversation spirals through philosophical debates about existence, raising questions about the essence of physical objects and the implications of multiple universes. Holt’s insights lead to a captivating blend of humor and deep existential inquiry.
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Multiple Universes Challenge Knowledge
- The idea of multiple universes challenges the goal of understanding "everything" in physics.
- Instead, physics may only describe our sub-universe among infinitely many possible others.
From One To Many Changes Questions
- Focusing on one unique feature can mislead about its true importance.
- Discovering many planets showed Earth's distance from the sun is just one possibility, not a deep law.
Fundamental Laws Transcend Universes
- Fundamental mathematical laws may govern all universes despite huge environmental differences.
- Gravity is an example of a law manifesting differently but applying everywhere universally.
