Closer To Truth

Could a single theory explain the fundamental workings of the universe?

Theoretical physicist Michio Kaku joins Robert Lawrence Kuhn to discuss The God Equation and the quest for a Theory of Everything. They explore string theory, the multiverse, higher dimensions, time travel, the Big Bang, and what a final theory might reveal about reality and our place in the cosmos.

This conversation was originally recorded following the publication of Kaku’s The God Equation: The Quest for a Theory of Everything.

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Can your theory of consciousness determine your answers to the biggest questions in philosophy, science, and religion — AI sentience, life after death, free will, personal identity?

Robert Lawrence Kuhn is the creator, producer, writer, and host of _Closer To Truth,_ the long-running PBS series and global resource on cosmos, consciousness, and meaning. He holds a PhD in anatomy and brain research from UCLA and is the author of "A Landscape of Consciousness: Toward a Taxonomy of Explanations and Implications," editor-in-chief of the Landscape of Consciousness website, which currently catalogues nearly 450 theories of consciousness. The Landscape of Consciousness website: https://loc.closertotruth.com/

Venerable Dr. Yifa is the founder and director of the Woodenfish Foundation, an international, nonsectarian nonprofit dedicated to building a global network of ethical and compassionate leaders. A Yale-educated Buddhist nun and Associate at the Harvard University Asia Center, she has appeared on Closer To Truth exploring Buddhist philosophy. The Woodenfish Forum on Buddhism, Science & Future was founded by Venerable Dr. Yifa with the aspiration of engaging Buddhist thought through the lens of scientific inquiry. The 2026 forum brought together leading scientists, philosophers, and religious thinkers to explore reincarnation, consciousness, and the ethics of frontier biotechnology.

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Everything we know, everything we think, comes from our brain. Are brains our window to reality, seeing what truly exists? Or are we bound by brains, mental slaves of the meat in our heads? Featuring interviews with Christopher Evans, Kelsey Martin, Robert Bilder, Jared Diamond, and Rodney Brooks.

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Celia Deane-Drummond talks the evolution of wisdom, COVID-19 and the boundary between natural and moral evil, Christian theology, and redeeming sin. She also discusses her book, Shadow Sophia, the second volume in her Evolution of Wisdom series.

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Is there more than one universe? According to current cosmology, our entire gigantic universe is only one of innumerable universes, each universe like one tiny bubble in a limitless ocean of universes. What could all this mean? Featuring interviews with Max Tegmark, Anthony Aguirre, Alan Guth, Andrei Linde, and Paul Davies.

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What is “nothing”?

What does it mean for nothing to exist—or for nothing to have ever existed? In this episode, Robert Lawrence Kuhn explores one of philosophy’s deepest questions: Why is there something rather than nothing? Through conversations with philosophers and physicists, the discussion examines the nature of nothingness, whether absolute nothing is possible, and how different philosophical and scientific perspectives attempt to explain the existence of the universe.

Featuring Richard Swinburne, Simon Blackburn, Robert Spitzer, Peter van Inwagen, Steven Weinberg, John Leslie, Timothy O’Connor, Victor Stenger, John Hawthorne, and Peter Forrest.

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How do natural laws shape human societies?

In this conversation, Saleem Ali discusses Earthly Order: How Natural Laws Define Human Life, exploring connections between natural systems, social organization, economics, and political order. Ali examines how concepts such as order, chaos, emergence, hierarchy, and complexity operate across scales—from physics and ecology to governance and global sustainability.

Saleem H. Ali is the Blue and Gold Distinguished Professor of Energy and the Environment at the University of Delaware. His research focuses on environmental conflicts, sustainability, natural resources, and ecological cooperation in international relations.

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What can Galileo still teach us about science, truth, and discovery?

In this conversation, Mario Livio discusses Galileo’s scientific legacy, the Hubble Space Telescope, science denial, exoplanets, cosmology, and the future of life in the universe. Drawing from his book Galileo: And the Science Deniers, Livio explores Galileo’s role in the development of the scientific method and examines how scientific understanding evolves through observation, experimentation, and self-correction.

Mario Livio is an astrophysicist and author who worked for 24 years at the Space Telescope Science Institute, which operates the Hubble Space Telescope.

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Do we really have free will?

In this conversation, Gregg Caruso explores the philosophy of free will, moral responsibility, determinism, compatibilism, libertarian free will, and free will skepticism. Discussing themes from Just Deserts: Debating Free Will, co-authored with Daniel Dennett, Caruso examines whether human beings possess the kind of control required for moral responsibility and how neuroscience and philosophy shape the debate.

Gregg D. Caruso is Professor of Philosophy at SUNY Corning and Honorary Professor of Philosophy at Macquarie University.

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How do we measure the expansion of the universe?

In this conversation, Wendy Freedman discusses the Hubble constant, standard candles, redshift, and the ongoing effort to determine the age, size, and evolution of the universe. Exploring Cepheid variables, supernovae, cosmic expansion, and the tension between competing cosmological measurements, Freedman explains how increasingly precise observations are reshaping modern cosmology.

Wendy Freedman is an astronomer known for her measurements of the Hubble constant and for her leadership of the Carnegie Observatories in Pasadena, California, and Las Campanas, Chile.

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