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    #428 – Sean Carroll: General Relativity, Quantum Mechanics, Black Holes & Aliens

    Interdisciplinary collaboration and broad thinking led to the discovery of a neutrino cutoff in Antarctic ice, revealing insights into the accelerating universe.

    enApril 22, 2024

    About this Episode

    Sean Carroll is a theoretical physicist, author, and host of Mindscape podcast. Please support this podcast by checking out our sponsors: - HiddenLayer: https://hiddenlayer.com/lex - Cloaked: https://cloaked.com/lex and use code LexPod to get 25% off - Notion: https://notion.com/lex - Shopify: https://shopify.com/lex to get $1 per month trial - NetSuite: http://netsuite.com/lex to get free product tour Transcript: https://lexfridman.com/sean-carroll-3-transcript EPISODE LINKS: Sean's Website: https://preposterousuniverse.com Mindscape Podcast: https://www.preposterousuniverse.com/podcast/ Sean's YouTube: https://youtube.com/@seancarroll Sean's Patreon: https://www.patreon.com/seanmcarroll Sean's Twitter: https://twitter.com/seanmcarroll Sean's Instagram: https://instagram.com/seanmcarroll Sean's Papers: https://scholar.google.com/citations?user=Lfifrv8AAAAJ Sean's Books: https://amzn.to/3W7yT9N PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (11:03) - General relativity (23:22) - Black holes (28:11) - Hawking radiation (32:19) - Aliens (41:15) - Holographic principle (1:05:38) - Dark energy (1:11:38) - Dark matter (1:20:34) - Quantum mechanics (1:41:56) - Simulation (1:44:18) - AGI (1:58:42) - Complexity (2:11:25) - Consciousness (2:20:32) - Naturalism (2:24:49) - Limits of science (2:29:34) - Mindscape podcast (2:39:29) - Einstein

    🔑 Key Takeaways

    • Hidden Layer secures machine learning models from bad actors, Cloaked generates new emails and phone numbers for privacy, and Notion is a recommended productivity tool for note-taking and team collaboration.
    • Notion's AI assistant enhances productivity by generating drafts, answering questions, and managing projects, making it ideal for small teams and expected to be even more effective for larger organizations. Shopify allows selling unique items, and NetSuite manages large companies with ease.
    • Einstein revolutionized physics by viewing space and time as interconnected aspects of a four-dimensional continuum, leading to groundbreaking discoveries like the explanation of gravity and the invention of photons.
    • Einstein's insight that gravity is not a force but a feature of spacetime curvature required him to learn advanced math and challenged our perception of objective reality.
    • Black holes are regions of intense gravitational pull where time slows and objects fade from view, but their true nature remains a mystery, and falling into one would result in the collapse of spacetime and transformation of information, not destruction.
    • Black holes radiate and evaporate, but detecting their Hawking radiation is challenging. Supermassive black holes' existence early in the universe adds to their mystery. Their rarity might be crucial for complex life forms' development.
    • Despite uncertainties, the search for extraterrestrial life requires considering various possibilities, including communication methods, timeframes for complex life development, and humility in our approach to the vast universe.
    • The Holographic Principle proposes that all information in a black hole can be stored at its boundary, challenging our understanding of gravity and the nature of black holes.
    • Quantum field theory suggests humans and other objects are mostly empty space, while black holes are dense with information but also high in entropy. Information in black holes isn't destroyed but scattered when they evaporate, and singularities represent potential collapses of space-time.
    • The holographic principle raises questions about the nature of time inside black holes, whether it's fundamental or emergent, and its implications for the universe as a whole. Scientists are exploring these ideas, but many challenges remain in testing and understanding these phenomena.
    • Scientists propose that quantum field theory states are not exactly perpendicular to each other, allowing for more information in black holes than the holographic principle suggests. This idea, called 'overlap of states,' was tested with neutrinos and the IceCube experiment but results were inconclusive.
    • Interdisciplinary collaboration and broad thinking led to the discovery of a neutrino cutoff in Antarctic ice, revealing insights into the accelerating universe.
    • Dark energy, a pervasive field with unique properties, challenges fundamental assumptions in particle physics due to its vastly different length and time scales. Imposing symmetries to protect it from interaction allows for potential detection through photon polarization effects.
    • Scientists continue to search for a unified theory to explain dark matter and dark energy, but attempts to modify gravity have not been successful.
    • Physicist Lawrence Krauss emphasizes the power of equations and data in leading to a comprehensive understanding of the universe, including the potential of quantum mechanics.
    • Quantum mechanics' measurement problem leads to different interpretations, such as the Copenhagen and Many Worlds interpretations, which propose that measurement causes wave function collapse or all possible outcomes exist in different worlds, respectively.
    • The Many-Worlds Interpretation suggests multiple, non-interacting universes, each with distinct quantum states, challenging our understanding of identity, probability, and prediction.
    • Our understanding of the universe is still evolving, some questions may never be definitively answered, and the concept of a creator or outside force may not apply to the universe as we currently understand it.
    • Despite intrigue, current language models can't create human-like beings or understand consciousness, focusing on their capabilities and practical challenges instead.
    • Large language models can mimic human-like behavior but don't truly understand the world like humans do, as they are optimized for data compression rather than constructing a world model.
    • AI's advancement is driven by expanded compute and physics, but it's crucial to balance efficiency and scale to minimize negative impacts, and exploring complexity and emergence can provide valuable insights.
    • The speaker explores the connection between information and complexity, suggesting that understanding this relationship could shed light on the emergence of complexity from simplicity in the universe. Entropy and black holes are areas of particular interest.
    • Complexity is a measure of the information needed to specify a system's configuration, with various forms including configurational complexity and the complexity of self-sustaining systems like stars and organisms. The universe's complexity continues to evolve, with significant stages including the emergence of information processing and mental time travel.
    • The debate between panpsychism and physicalism explores the nature of consciousness, with panpsychists suggesting a non-physical entity and physicalists viewing it as an emergent property of matter.
    • Imagination can influence perception and bring change, but it doesn't alter reality's fundamental truth. As knowledge advances, beliefs and understandings may shift, but naturalism's causally efficacious interpretations remain valid.
    • Science can't explain moral and aesthetic judgments, but it can help us navigate the world effectively by understanding the functioning of the human mind and achieving our goals, even if they're morally questionable.
    • Theoretical physicist Sean Carroll emphasizes understanding complexity and emergence, preparing thoroughly for interviews, and fostering organic conversations with broad-knowledge guests to bridge the gap between scientific understanding and public accessibility.
    • Effectively communicate and engage with diverse topics, prioritize substantive disagreements, and avoid personal attacks or psychologizing others.
    • Scientific discoveries, like Einstein's theory of general relativity, are beautiful and complex, resulting from human collaboration, competition, and tension. Celebrate the stories behind the discoveries.

    📝 Podcast Summary

    Ensuring Security for Machine Learning Models and Personal Information

    As we increasingly rely on machine learning models for truth-seeking and analysis, it's crucial to ensure their security. Hidden Layer, a sponsor of this episode, is addressing this issue by providing a platform that secures machine learning models from bad actors. These models, which are trained on vast amounts of data from various sources, are used for general conversation and specific data analysis. However, if left unsecured, they can be manipulated to provide false information. This is a serious concern for both individuals and companies. Cloaked, another sponsor, offers a solution to protect personal information by generating new emails and phone numbers for each new sign-up. This simple yet effective tool helps maintain privacy, especially for smaller companies and services that may not have robust security measures. Lastly, Notion, a note-taking and team collaboration tool, was introduced as a highly recommended productivity tool. Overall, the episode emphasizes the importance of security and privacy in our increasingly digital world and highlights the solutions provided by Hidden Layer, Cloaked, and Notion.

    Exploring Notion's AI capabilities and integrations with Shopify and NetSuite

    Notion is a versatile tool that combines individual note-taking, collaborative features, and AI capabilities to enhance productivity. The speaker expressed his gratitude for Notion's AI assistant, which integrates language models to help generate drafts, answer questions, and manage projects. While it shines for small teams, it's expected to be even more effective for larger organizations. The power of Notion lies not only in its AI capabilities but also in how it integrates them into an intuitive user interface. Additionally, the speaker shared his appreciation for the joy of selling unique items, like shirts, through Shopify and the science and art of managing a large company with NetSuite.

    Einstein's Shift in Perspective: Space, Time, and the Four-Dimensional Continuum

    Albert Einstein's groundbreaking work in physics, particularly his theories of special and general relativity, involved a profound shift in perspective. He challenged the traditional separation of space and time, instead viewing them as interconnected aspects of a four-dimensional "space-time" continuum. This idea allowed him to solve the problem of gravity, which had eluded him in his earlier attempts to reconcile it with his new relativistic theory. The potential of this new perspective was recognized by mathematician Hermann Minkowski, and the tension between physics and mathematics played a significant role in Einstein's discoveries. Contrary to the common narrative, Einstein's later objections to quantum mechanics were not due to a lack of understanding but rather a philosophical disagreement with its underlying principles. Despite some missteps, such as his unsuccessful attempts to unify electricity and magnetism with gravity, Einstein's greatness lies in his ability to think creatively and make fundamental leaps in understanding the natural world. His accomplishments, including the explanation of Brownian motion and the invention of photons, earned him a place in history as one of the greatest physicists of all time.

    Albert Einstein's realization of gravity as spacetime curvature

    Albert Einstein's thought experiment on the equivalence of gravity and acceleration led him to realize that gravity is not like other forces, such as electric or magnetic fields. Instead, it's a feature of the curvature of spacetime. This insight required Einstein to learn the mathematical tools of differential geometry to describe curvature. Minkowski's idea of combining space and time as dimensions was a profound insight, not a simple mathematical leap. The difference between space and time from the perspective of general relativity is minimal, but significant: the time you measure depends on your path, just like the distance you travel. This idea challenges our perception of objective reality and the relationship between observed reality and the underlying theoretical framework.

    Approaching a Black Hole: Time Slows and Objects Fade

    Black holes, according to Einstein's theory of general relativity, are regions in spacetime where the gravitational forces are so strong that once an object enters, it can't leave. This concept is hard to imagine as it defies our everyday experiences. As you approach a black hole, time appears to slow down, and an object seems to fade from view. However, it's important to remember that these are approximations, and the true nature of black holes, particularly at their singularities, remains a mystery. Despite Einstein's discovery of the Schwarzschild solution in 1915, it took decades for scientists to fully understand the implications of this solution. Black holes are not objects but regions of spacetime, and if you were to fall into one, you would experience the collapse of spacetime around you, ultimately leading to your destruction. Information, however, is not destroyed but rather transformed, according to our current understanding of physics.

    Black holes and the fate of information

    Black holes, according to current understanding of both quantum mechanics and general relativity, are believed to radiate and eventually evaporate, raising the question of what happens to the information that falls into them. Most scientists propose that this information is transferred to the radiation, preserving the law of information conservation. However, detecting this Hawking radiation is a major challenge due to the large sizes and low temperatures of most black holes. The discovery of supermassive black holes existing early in the universe adds to the mystery of their origin. Despite the difficulty of creating black holes, their rarity may be essential for the development of complex life forms in the universe. The existence of intelligent alien civilizations remains an open question, but the scarcity of noticeable ones suggests that they might be rare or difficult to form.

    The Search for Extraterrestrial Life: Challenges and Complexities

    The existence of extraterrestrial life and intelligent civilizations is still a mystery with many uncertainties. The time it takes for life to develop complex forms is a significant factor, and the distance and communication methods between civilizations add to the complexity. Some argue that advanced civilizations might not be actively trying to contact us, and that finding common languages or understanding their communication methods could be a challenge. The detection of extraterrestrial life through spectroscopic data is a difficult question, and simple approaches like looking for long molecules might not be enough. Ultimately, the search for extraterrestrial life requires a humble and open-minded approach, considering various possibilities and the vastness of the universe.

    The Holographic Principle: Information Lives on the Event Horizon of a Black Hole

    The holographic principle suggests that the information contained in a black hole can be thought of as living on its event horizon rather than in its interior. This idea, which was originally proposed by physicists like Leonard Susskind and Gerard 't Hooft, gained more clarity and substance with the AdS/CFT correspondence in the 1990s. This theory suggests that a lower-dimensional theory without gravity is casting a hologram into a higher-dimensional universe to create the illusion of gravity. The implications of this idea are significant, as it suggests that all the information that goes into a black hole can be stored at its boundary, making it an intriguing area of research for theoretical physicists. Additionally, the speaker emphasized the importance of intellectual humility and being prepared for surprises in our quest to understand the universe. The development of intelligence and our ability to manipulate the physical world around us may be key indicators of advanced life forms. However, we should remain open-minded to the possibility of unexpected discoveries.

    Quantum field theory challenges our understanding of human existence and black holes

    According to quantum field theory, humans and other objects are mostly empty space from an information density perspective. However, when space-time becomes flexible due to general relativity and quantum mechanics, the very concept of a location becomes uncertain, allowing information to propagate in unexpected ways. Black holes, which are incredibly dense with information but also high in entropy, provide a theoretical prediction that the information that goes into a black hole is not destroyed, but rather scattered across a vast area of space-time when the black hole evaporates. The interior of a black hole is predicted to contain a singularity, which is not at the center but rather in our future, representing a moment of time and a potential collapse of space-time. Despite the counterintuitive nature of these concepts, ongoing research continues to explore the implications of quantum mechanics and general relativity on our understanding of information and the behavior of black holes.

    Understanding the nature of time in the context of the holographic principle

    The holographic principle, which suggests that the universe can be mathematically described as a hologram, raises many intriguing questions about the nature of space, time, and information. According to the discussion, it is currently unclear what happens to time inside a black hole or whether it is fundamental or emergent. The principle itself is about the question of space, but there are still many unanswered questions about its implications for time. Some scientists believe we are close to figuring out how information gets out of black holes or how to quantize gravity, while others remain skeptical. The biggest surprise for some scientists would be if quantum mechanics itself were superseded by something better. There are also intriguing possibilities that black holes could create new universes or serve as portals to other places, but these are still speculative ideas. The challenges lie in testing and exploring these objects, which are difficult to access due to their extreme conditions.

    Reconciling Quantum Field Theory and the Holographic Principle

    Scientists are trying to reconcile the apparent mismatch between quantum field theory and the holographic principle, which predicts less information in black holes than naively expected. They propose that quantum field theory states are not exactly perpendicular to each other, allowing for more states than the holographic principle suggests. This idea, called the "overlap of states," was tested using neutrinos and the IceCube experiment in Antarctica, which found that the effect is not yet detectable. The researchers suggest that neutrinos, unlike most cosmic rays which are protons, may dissolve into other neutrinos due to their non-perpendicularity in quantum field theory. This hypothesis could explain why neutrinos, which pass through the Earth, are not detected as often as protons, which create showers of particles when they hit the Earth's atmosphere. However, more research is needed to confirm this idea.

    Detecting Neutrinos in Antarctic Ice and Its Implications

    Neutrinos, subatomic particles that pass through our bodies from the sun and the universe, can be detected using large amounts of transparent and dense ice, such as the Antarctic ice sheet. These neutrinos follow a specific energy spectrum, and scientists predict that there should be a cutoff to the number of high-energy neutrinos detected. The IceCube experiment, which uses Antarctic ice as a neutrino detector, has shown this cutoff in their data. This discovery was led by Oliver Friedrich, a postdoc researcher, and it required theoretical physicists to step back from their area of expertise and consider the broader implications of their research. This approach led to the discovery of a relatively natural explanation for the accelerating universe, which was a significant prediction in the field of physics. Overall, this research highlights the importance of interdisciplinary collaboration and the ability to identify the best match between one's interests, abilities, and the most pressing questions in science.

    The enigma of dark energy and its impact on particle physics

    The discovery of dark energy, a pervasive field that is slowly changing and has eluded interaction with other known fields, challenges the fundamental assumptions of particle physics due to its vastly different length and time scales. To protect dark energy from interacting with other fields and keep its dynamics slow, physicists propose imposing symmetries. This not only makes it harder to detect but also allows for the possibility of observing its effects on photon polarization. Despite the challenges, dark energy remains an intriguing and essential part of our understanding of the universe, with ongoing research aiming to uncover its true nature. Dark energy's uniform presence and apparent constancy have led many to view it as a mysterious force that defies explanation. However, its similarity to the discovery of dark matter, a previously unobserved particle that explained discrepancies in Newtonian gravity, highlights the importance of expanding our understanding of the physical world. While dark matter and dark energy share the label "dark," they are fundamentally different: dark matter is a particle, while dark energy is a field with unique properties. As we continue to explore the universe, it is essential to remain open-minded and willing to challenge our current understanding in pursuit of new knowledge.

    Exploring Alternatives to Dark Matter

    While we have strong evidence for the existence of dark matter based on various independent lines of observation, scientists are still hoping to find a more exciting explanation for it than just another particle. One intriguing idea is modifying gravity itself, but attempts to do so have not been successful. Dark matter and dark energy, two mysterious phenomena, become significant when gravity is very weak. Scientists have proposed theories where gravity behaves differently in such situations, but so far, none have been able to fully explain both dark matter and dark energy. Despite the challenges, the search for a unified theory continues.

    From simple principles to complex phenomena

    Physicist Lawrence Krauss believes that the beauty of physics lies in its ability to take simple, austere principles and lead to complex phenomena, such as the world around us. He emphasizes the importance of equations and data in guiding scientific understanding, and shares his excitement about the potential of quantum mechanics to describe the universe comprehensively. Krauss has made significant contributions to the field, including papers on Lorentz and parity violation, quintessence, and the cosmic speed up. Despite the challenges and controversies, such as the interpretation of quantum mechanics, he remains passionate about the pursuit of knowledge and the potential for new discoveries.

    The act of measuring an electron's spin changes it from a superposition to a definite state

    According to quantum mechanics, the act of measuring an electron's spin results in a radical change from a superposition of clockwise and counterclockwise to a definite state of either clockwise or counterclockwise. This measurement problem leads to different interpretations, such as the Copenhagen interpretation and the Many Worlds interpretation. The Copenhagen interpretation suggests that the act of measurement causes the wave function to collapse, while the Many Worlds interpretation proposes that all possible outcomes exist in different worlds, each with its own wave function. The measurement problem and the interpretation of it remain a fundamental mystery in quantum mechanics.

    Many-Worlds Interpretation: Multiple Universes with Unique Quantum States

    The Many-Worlds Interpretation of quantum mechanics proposes the existence of multiple, non-interacting universes, each with its unique set of quantum states. These universes cannot be traveled between, and the equations of quantum mechanics predict their existence, even if they are hard to visualize or understand. The implications of this theory challenge our understanding of identity, probability, and prediction, requiring a new philosophical framework. The arrow of time in Many-Worlds is consistent with that of entropy and thermodynamics, making the universe deterministic in a sense. The entire history of the universe is contained in the wave function of each universe, although not in the same way as human memory. The act of forming a memory is an irreversible process, increasing the entropy of the universe. While it's a significant philosophical leap, many believe it's necessary to fully understand quantum mechanics.

    The mysteries of the universe: origins of time and space

    Our current understanding of the universe, particularly regarding the origins of time and space, leaves many questions unanswered. Some questions, like the temperature of the universe shortly after the Big Bang, can be answered with high precision. However, other questions, such as the cause of the Big Bang or the existence of a universe outside our own, remain a mystery. Theories like quantum gravity and the emergence of time may provide some insight, but they also introduce new complexities. Ultimately, it's important to recognize that our understanding of the universe is still evolving, and that some questions may never be definitively answered. Additionally, the concept of a creator or an outside force may not apply to the universe as we currently understand it. Instead, the universe may be the totality of everything, with no beginning or end. This idea can be both humbling and exciting, as it suggests the possibility of infinite worlds and the ongoing exploration of the unknown. However, it's crucial to approach these questions with caution, as they may not be answerable through experimental verification or falsification. Instead, they require a thoughtful and open-minded approach to scientific inquiry.

    The universe's existence and simulation debate

    The question of why the universe exists and the possibility of it being a simulation are philosophical questions without definitive answers. While it's intriguing to consider the possibility of creating better simulations or artificial intelligence, the current capabilities of language models and our understanding of consciousness and awareness suggest that we're not close to creating a machine indistinguishable from a human being. The debate lies in the limits of large language models and their ability to truly understand and reason like humans. The focus should be on appreciating their capabilities for what they are and using them effectively, rather than anthropomorphizing them. Additionally, the practical challenges of creating a realistic simulation or artificial general intelligence make it a concern for the future rather than the present.

    Understanding the limitations of large language models

    Large language models like Google Maps are not sentient beings with intentions, despite our natural human tendency to attribute intentionality to them. They are optimized for understanding and creating a compressed representation of the world based on the data they are trained on. The discovery of the Othello board by a neural network is an intriguing example of this, but it's unclear whether the network truly discovered the board on its own or if some understanding was built into the probe used to test it. The distinction between how large language models are trained and what they are optimized for is important to understand, as they are not optimized for constructing a world model in the same way humans are. The implications of this for the future of AI research are vast and open-ended. It's an exciting time to explore the capabilities and limitations of large language models, as they continue to amaze us with their ability to act human-like, but the true nature of their understanding of the world remains an open question.

    Recent progress in machine learning and AI

    The recent progress in machine learning and AI has been impressively remarkable, surpassing initial expectations. This progress may be attributed to expanding the scale of compute and the potential role of physics in optimizing energy efficiency. However, it's important to consider the balance between efficiency and scale, as there are environmental constraints and potential harm caused by the creation of increasingly powerful technologies. The future of AI lies in its ability to continue improving while minimizing negative impacts. The exploration of complexity and emergence from simple interactions, as studied at the Santa Fe Institute, offers valuable insights into this ongoing development.

    The role of information in driving complexity

    The emergence of complexity from simplicity is a fascinating and largely uncharted territory in our understanding of the universe. While some discoveries have been made, particularly in the realm of information and systems like cellular automata, the fundamental principles are still not well-understood. The key, according to the speaker, is the role of information in driving complexity. However, the mechanism of how this plays out in the real world with the laws of physics and the arrow of time remains an open question. The speaker is intrigued by the role of entropy in the universe and how it relates to complexity. Black holes, with their vast amounts of entropy, are a particularly intriguing area of study. The speaker believes that understanding the landscape of entropy in the universe and how it relates to complexity is an answerable question, even if cellular automata may not be the answer.

    Exploring the relationship between complexity and entropy in the universe

    We are not fighting against the increase of entropy in the universe, but rather using it to maintain our stability as non-equilibrium systems. Complexity, which can take various forms, is a concept that is still being explored and doesn't have a unified definition. One version of complexity is configurational complexity, which measures the amount of information needed to specify the configuration of a system. Another form of complexity comes into play when subsystems of the universe start burning fuel to maintain their stability, such as stars and living organisms. The complexity of the universe continues to evolve, with the emergence of information processing and mental time travel being significant stages. Ultimately, understanding the different stages and how they fit together is crucial for gaining a comprehensive view of the relationship between complexity and entropy in the universe.

    The shift from underwater to land-dwelling beings led to the birth of imagination and longer-term planning.

    The evolution of consciousness from underwater creatures to land-dwelling beings brought about a significant cognitive shift. This shift allowed for longer-term planning and the birth of imagination, as beings were no longer limited by their immediate surroundings and could consider various possibilities. In the philosophical realm, the debate between panpsychism and physicalism continues. Panpsychists argue that consciousness is not fully explainable by physics and that it requires a separate, non-physical entity to account for subjective experiences. Physicalists, on the other hand, believe that consciousness is an emergent property of physical matter and that there is no need to invoke a separate entity. Ultimately, both sides acknowledge that consciousness is a real and complex phenomenon that warrants further exploration.

    Imagination's Role in Perception and Change

    Our understanding of reality and the role of imagination in shaping it is a complex issue. While imagination can influence our perception and even bring about change, it doesn't alter the fundamental truth of reality. The concept of reality, including the laws of physics, may change as our knowledge advances, but the predictions it allows us to make remain true. The belief in illusions, like the existence of gods, can be reasonable given the knowledge of the time, but as we learn more, some beliefs are replaced with new understandings. Naturalism, or the belief that only the natural world exists, allows for various ways of interpreting the natural world as long as they are causally efficacious. Poetic naturalism acknowledges the complexity and diversity of scientific stories and allows for exploration of questions beyond the scope of current scientific understanding.

    Understanding the Limits of Science

    While scientific theories help us understand the physical world, they don't encompass moral and aesthetic judgments. These are subjective human constructs that can't be proven or disproven through experiments. We attach moral and aesthetic properties to physical phenomena, and recognizing this subjectivity can help us navigate the world more effectively. The human mind is part of the physical world, and understanding its functioning can help explain why people hold certain moral beliefs, but it won't justify them as right or wrong. The idea of a theory that includes the observer effect, where the human mind morphs reality, is intriguing but complex. Sean Garrett, a prolific writer, emphasizes the importance of ignoring distractions and finding a writing process that works for each individual. While science can't tell us right from wrong, it can help us achieve our goals, even if they are morally questionable. The day-to-day writing process for popular science books involves deep thinking and writing the final draft almost directly from the brain, with minimal editing or outlining.

    Exploring Complexity with Sean Carroll: Balancing Preparation and Organic Conversation

    Sean Carroll, a theoretical physicist, has written a trilogy of books that explore complex scientific concepts, making them accessible to a wide audience without sacrificing mathematical rigor. He emphasizes the importance of understanding complexity and emergence, focusing on established ideas rather than speculation. In preparing for his podcast interviews, Carroll has learned to balance thorough preparation with allowing for organic conversation. He finds that ideal guests have a broad scope of knowledge and can wander outside their specific research without being overly practiced or repetitive. Carroll's Ask Me Anything sessions on Patreon have evolved over time, starting with a small audience and now providing in-depth answers to a wide range of questions. Through his work, Carroll strives to bridge the gap between scientific understanding and public accessibility.

    Navigating a wide range of questions and effective communication

    Communication and sharing knowledge can be a complex and nuanced process. The speaker in this discussion, who runs a Patreon where they answer questions for their subscribers, shared that they receive a wide range of questions, from physics and philosophy to personal and mundane topics. They strive to provide interesting answers and engage with various topics, but with the increasing number of questions, they have to prioritize. The speaker also emphasized the importance of clear communication and understanding when disagreeing with others. They encouraged specifying substantive disagreements rather than resorting to personal attacks or psychologizing others. The speaker also shared their personal experience with being accused of arrogance, which they believed was often just a disguise for disagreement. Overall, the speaker's insights offer valuable lessons on effective communication, respectful disagreement, and the importance of engaging with diverse topics and ideas.

    Focusing on substance over insults in scientific debates

    While we may disagree on various topics and have differing opinions, it's essential to focus on the substance of the disagreement rather than resorting to insults. Einstein's theory of general relativity is a prime example of a beautiful and groundbreaking scientific discovery that started from clear assumptions and led to significant advancements, despite Einstein not receiving the Nobel Prize for it. Science is a human endeavor, filled with collaboration, competition, and tension, and it's important to celebrate and appreciate its beauty and complexity. Einstein's equation for general relativity is a testament to the power of scientific inquiry and the potential for discoveries to outlive their creators. Ultimately, the human stories behind scientific discoveries are just as fascinating as the discoveries themselves.

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    #428 – Sean Carroll: General Relativity, Quantum Mechanics, Black Holes & Aliens

    #428 – Sean Carroll: General Relativity, Quantum Mechanics, Black Holes & Aliens
    Sean Carroll is a theoretical physicist, author, and host of Mindscape podcast. Please support this podcast by checking out our sponsors: - HiddenLayer: https://hiddenlayer.com/lex - Cloaked: https://cloaked.com/lex and use code LexPod to get 25% off - Notion: https://notion.com/lex - Shopify: https://shopify.com/lex to get $1 per month trial - NetSuite: http://netsuite.com/lex to get free product tour Transcript: https://lexfridman.com/sean-carroll-3-transcript EPISODE LINKS: Sean's Website: https://preposterousuniverse.com Mindscape Podcast: https://www.preposterousuniverse.com/podcast/ Sean's YouTube: https://youtube.com/@seancarroll Sean's Patreon: https://www.patreon.com/seanmcarroll Sean's Twitter: https://twitter.com/seanmcarroll Sean's Instagram: https://instagram.com/seanmcarroll Sean's Papers: https://scholar.google.com/citations?user=Lfifrv8AAAAJ Sean's Books: https://amzn.to/3W7yT9N PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (11:03) - General relativity (23:22) - Black holes (28:11) - Hawking radiation (32:19) - Aliens (41:15) - Holographic principle (1:05:38) - Dark energy (1:11:38) - Dark matter (1:20:34) - Quantum mechanics (1:41:56) - Simulation (1:44:18) - AGI (1:58:42) - Complexity (2:11:25) - Consciousness (2:20:32) - Naturalism (2:24:49) - Limits of science (2:29:34) - Mindscape podcast (2:39:29) - Einstein

    #427 – Neil Adams: Judo, Olympics, Winning, Losing, and the Champion Mindset

    #427 – Neil Adams: Judo, Olympics, Winning, Losing, and the Champion Mindset
    Neil Adams is a judo world champion, 2-time Olympic silver medalist, 5-time European champion, and often referred to as the Voice of Judo. Please support this podcast by checking out our sponsors: - ZipRecruiter: https://ziprecruiter.com/lex - Eight Sleep: https://eightsleep.com/lex to get special savings - MasterClass: https://masterclass.com/lexpod to get 15% off - LMNT: https://drinkLMNT.com/lex to get free sample pack - NetSuite: http://netsuite.com/lex to get free product tour Transcript: https://lexfridman.com/neil-adams-transcript EPISODE LINKS: Neil's Instagram: https://instagram.com/naefighting Neil's YouTube: https://youtube.com/NAEffectiveFighting Neil's TikTok: https://tiktok.com/@neiladamsmbe Neil's Facebook: https://facebook.com/NeilAdamsJudo Neil's X: https://x.com/NeilAdamsJudo Neil's Website: https://naeffectivefighting.com Neil's Podcast: https://naeffectivefighting.com/podcasts/the-dojo-collective-podcast A Life in Judo (book): https://amzn.to/4d3DtfB A Game of Throws (audiobook): https://amzn.to/4aA2WeJ PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (09:13) - 1980 Olympics (26:35) - Judo explained (34:40) - Winning (52:54) - 1984 Olympics (1:01:55) - Lessons from losing (1:17:37) - Teddy Riner (1:37:12) - Training in Japan (1:52:51) - Jiu jitsu (2:03:59) - Training (2:27:18) - Advice for beginners

    #426 – Edward Gibson: Human Language, Psycholinguistics, Syntax, Grammar & LLMs

    #426 – Edward Gibson: Human Language, Psycholinguistics, Syntax, Grammar & LLMs
    Edward Gibson is a psycholinguistics professor at MIT and heads the MIT Language Lab. Please support this podcast by checking out our sponsors: - Yahoo Finance: https://yahoofinance.com - Listening: https://listening.com/lex and use code LEX to get one month free - Policygenius: https://policygenius.com/lex - Shopify: https://shopify.com/lex to get $1 per month trial - Eight Sleep: https://eightsleep.com/lex to get special savings Transcript: https://lexfridman.com/edward-gibson-transcript EPISODE LINKS: Edward's X: https://x.com/LanguageMIT TedLab: https://tedlab.mit.edu/ Edward's Google Scholar: https://scholar.google.com/citations?user=4FsWE64AAAAJ TedLab's YouTube: https://youtube.com/@Tedlab-MIT PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (10:53) - Human language (14:59) - Generalizations in language (20:46) - Dependency grammar (30:45) - Morphology (39:20) - Evolution of languages (42:40) - Noam Chomsky (1:26:46) - Thinking and language (1:40:16) - LLMs (1:53:14) - Center embedding (2:19:42) - Learning a new language (2:23:34) - Nature vs nurture (2:30:10) - Culture and language (2:44:38) - Universal language (2:49:01) - Language translation (2:52:16) - Animal communication

    #425 – Andrew Callaghan: Channel 5, Gonzo, QAnon, O-Block, Politics & Alex Jones

    #425 – Andrew Callaghan: Channel 5, Gonzo, QAnon, O-Block, Politics & Alex Jones
    Andrew Callaghan is the host of Channel 5 on YouTube, where he does street interviews with fascinating humans at the edges of society, the so-called vagrants, vagabonds, runaways, outlaws, from QAnon adherents to Phish heads to O Block residents and much more. Please support this podcast by checking out our sponsors: - ShipStation: https://shipstation.com/lex and use code LEX to get 60-day free trial - BetterHelp: https://betterhelp.com/lex to get 10% off - LMNT: https://drinkLMNT.com/lex to get free sample pack - MasterClass: https://masterclass.com/lexpod to get 15% off - AG1: https://drinkag1.com/lex to get 1 month supply of fish oil Transcript: https://lexfridman.com/andrew-callaghan-transcript EPISODE LINKS: Channel 5 with Andrew Callaghan: https://www.youtube.com/channel5YouTube Andrew's Instagram: https://instagram.com/andreww.me Andrew's Website: https://andrew-callaghan.com/ Andrew's Patreon: https://www.patreon.com/channel5 This Place Rules: https://www.hbo.com/movies/this-place-rules Books Mentioned: On the Road: https://amzn.to/4aLPLHi Siddhartha: https://amzn.to/49rthKz PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (08:53) - Walmart (10:24) - Early life (29:14) - Hitchhiking (40:49) - Couch surfing (49:50) - Quarter Confessions (1:07:33) - Burning Man (1:22:44) - Protests (1:28:17) - Jon Stewart (1:31:13) - Fame (1:44:31) - Jan 6 (1:48:15) - QAnon (1:54:00) - Alex Jones (2:10:52) - Politics (2:20:29) - Response to allegations (2:37:28) - Channel 5 (2:43:04) - Rap (2:44:51) - O Block (2:48:47) - Crip Mac (2:51:59) - Aliens

    #424 – Bassem Youssef: Israel-Palestine, Gaza, Hamas, Middle East, Satire & Fame

    #424 – Bassem Youssef: Israel-Palestine, Gaza, Hamas, Middle East, Satire & Fame
    Bassem Youssef is an Egyptian-American comedian & satirist, referred to as the Jon Stewart of the Arab World. Please support this podcast by checking out our sponsors: - AG1: https://drinkag1.com/lex to get 1 month supply of fish oil - Shopify: https://shopify.com/lex to get $1 per month trial - Eight Sleep: https://eightsleep.com/lex to get special savings - LMNT: https://drinkLMNT.com/lex to get free sample pack Transcript: https://lexfridman.com/bassem-youssef-transcript EPISODE LINKS: Bassem's X: https://x.com/Byoussef Bassem's Instagram: https://instagram.com/bassem Bassem's Facebook: https://facebook.com/bassemyousseftv Bassem's Website: https://bassemyoussef.xyz PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (06:30) - Oct 7 (36:59) - Two-state solution (52:37) - Holocaust (1:00:24) - 1948 (1:09:17) - Egypt (1:23:39) - Jon Stewart (1:25:51) - Going viral during the Arab Spring (1:49:55) - Arabic vs English (2:02:18) - Sam Harris and Jihad (2:07:25) - Religion (2:26:37) - TikTok (2:31:10) - Joe Rogan (2:33:07) - Joe Biden (2:37:33) - Putin (2:39:21) - War (2:44:17) - Hope

    #423 – Tulsi Gabbard: War, Politics, and the Military Industrial Complex

    #423 – Tulsi Gabbard: War, Politics, and the Military Industrial Complex
    Tulsi Gabbard is a politician, veteran, and author of For Love of Country. Please support this podcast by checking out our sponsors: - Riverside: https://creators.riverside.fm/LEX and use code LEX to get 30% off - ExpressVPN: https://expressvpn.com/lexpod to get 3 months free - NetSuite: http://netsuite.com/lex to get free product tour - Notion: https://notion.com/lex Transcript: https://lexfridman.com/tulsi-gabbard-transcript EPISODE LINKS: For Love of Country (book): https://amzn.to/3VLlofM Tulsi's X: https://x.com/tulsigabbard Tulsi's YouTube: https://youtube.com/@TulsiGabbard Tulsi's Podcast: https://youtube.com/@TheTulsiGabbardShow Tulsi's Instagram: https://instagram.com/tulsigabbard Tulsi's Facebook: https://facebook.com/TulsiGabbard Tulsi's Website: https://tulsigabbard.com/ PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (07:14) - War in Iraq (15:00) - Battle injuries and PTSD (22:10) - War on terrorism (30:51) - War in Gaza (34:52) - War in Ukraine (38:38) - Syria (46:20) - Warmongers (55:40) - Nuclear war (1:11:08) - TikTok ban (1:23:13) - Bernie Sanders (1:28:08) - Politics (1:46:59) - Personal attacks (1:49:07) - God

    #422 – Mark Cuban: Shark Tank, DEI & Wokeism Debate, Elon Musk, Politics & Drugs

    #422 – Mark Cuban: Shark Tank, DEI & Wokeism Debate, Elon Musk, Politics & Drugs
    Mark Cuban is a businessman, investor, star of TV series Shark Tank, long-time principal owner of Dallas Mavericks, and founder of Cost Plus Drugs. Please support this podcast by checking out our sponsors: - Listening: https://listening.com/lex and use code LEX to get one month free - Cloaked: https://cloaked.com/lex and use code LexPod to get 25% off - Notion: https://notion.com/lex - Eight Sleep: https://eightsleep.com/lex to get special savings - Shopify: https://shopify.com/lex to get $1 per month trial Transcript: https://lexfridman.com/mark-cuban-transcript EPISODE LINKS: Mark's X: https://twitter.com/mcuban Mark's Instagram: https://instagram.com/mcuban Cost Plus Drugs: https://costplusdrugs.com Shark Tank: https://abc.com/shows/shark-tank Dallas Mavericks: https://www.mavs.com PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (11:10) - Entrepreneurship (26:03) - Shark Tank (36:29) - How Mark made first billion (1:02:39) - Dallas Mavericks (1:08:05) - DEI debate (1:43:58) - Trump vs Biden (1:46:20) - Immigration (1:55:53) - Drugs and Big Pharma (2:11:53) - AI (2:16:05) - Advice for young people

    #421 – Dana White: UFC, Fighting, Khabib, Conor, Tyson, Ali, Rogan, Elon & Zuck

    #421 – Dana White: UFC, Fighting, Khabib, Conor, Tyson, Ali, Rogan, Elon & Zuck
    Dana White is the CEO and president of the UFC. Please support this podcast by checking out our sponsors: - LMNT: https://drinkLMNT.com/lex to get free sample pack - Notion: https://notion.com/lex - AG1: https://drinkag1.com/lex to get 1 month supply of fish oil - InsideTracker: https://insidetracker.com/lex to get 20% off Transcript: https://lexfridman.com/dana-white-transcript EPISODE LINKS: Dana's X: https://x.com/danawhite Dana's Instagram: https://instagram.com/danawhite Dana's Facebook: https://facebook.com/danawhite UFC's YouTube: https://youtube.com/@UFC UFC's Website: https://ufc.com/ PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (06:31) - Mike Tyson and early days of fighting (17:10) - Jiu jitsu (23:14) - Origin of UFC (37:25) - Joe Rogan (43:31) - Lorenzo Fertitta (45:58) - Great fighters (49:55) - Khabib vs Conor (53:01) - Jon Jones (56:03) - Conor McGregor (1:01:05) - Trump (1:06:44) - Elon vs Zuck (1:08:04) - Mike Tyson vs Jake Paul (1:10:52) - Forrest Griffin vs Stephan Bonnar (1:18:06) - Gambling (1:33:08) - Mortality

    #420 – Annie Jacobsen: Nuclear War, CIA, KGB, Aliens, Area 51, Roswell & Secrecy

    #420 – Annie Jacobsen: Nuclear War, CIA, KGB, Aliens, Area 51, Roswell & Secrecy
    Annie Jacobsen is an investigative journalist and author of "Nuclear War: A Scenario" and many other books on war, weapons, government secrecy, and national security. Please support this podcast by checking out our sponsors: - HiddenLayer: https://hiddenlayer.com/lex - BetterHelp: https://betterhelp.com/lex to get 10% off - Policygenius: https://policygenius.com/lex - NetSuite: http://netsuite.com/lex to get free product tour Transcript: https://lexfridman.com/annie-jacobsen-transcript EPISODE LINKS: Nuclear War: A Scenario (book): https://amzn.to/3THZHfr Annie's Twitter: https://twitter.com/anniejacobsen Annie's Website: https://anniejacobsen.com/ Annie's Books: https://amzn.to/3TGWyMJ Annie's Books (audio): https://adbl.co/49ZnI7c PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (07:37) - Nuclear war (12:21) - Launch procedure (18:00) - Deterrence (21:34) - Tactical nukes (30:59) - Nuclear submarines (33:59) - Nuclear missiles (41:10) - Nuclear football (50:17) - Missile interceptor system (54:34) - North Korea (1:01:10) - Nuclear war scenarios (1:10:02) - Warmongers (1:14:31) - President's cognitive ability (1:20:43) - Refusing orders (1:28:41) - Russia and Putin (1:33:48) - Cyberattack (1:35:09) - Ground zero of nuclear war (1:39:48) - Surviving nuclear war (1:44:06) - Nuclear winter (1:54:29) - Alien civilizations (2:00:04) - Extrasensory perception (2:13:50) - Area 51 (2:17:48) - UFOs and aliens (2:28:15) - Roswell incident (2:34:55) - CIA assassinations (2:53:47) - Navalny (2:56:12) - KGB (3:02:48) - Hitler and the atomic bomb (3:06:52) - War and human nature (3:10:17) - Hope