Sean Carroll's Mindscape

It’s too easy to take laws of nature for granted. Sure, gravity is pulling us toward Earth today; but how do we know it won’t be pushing us away tomorrow? We extrapolate from past experience to future expectation, but what allows us to do that? “Humeans” (after David Hume, not a misspelling of “human”) think that what exists is just what actually happens in the universe, and the laws are simply convenient summaries of what happens. “Anti-Humeans” think that the laws have an existence of their own, bringing what happens next into existence. The debate has implications for the notion of possible worlds, and thus for counterfactuals and causation — would Y have happened if X hadn’t happened first? Ned Hall and I have a deep conversation that started out being about causation, but we quickly realized we had to get a bunch of interesting ideas on the table first. What we talk about helps clarify how we should think about our reality and others. Support Mindscape on 

We've talked a lot recently about the Many Worlds of quantum mechanics. That’s one kind of multiverse that physicists often contemplate. There is also the cosmological multiverse, which we talked about with Brian Greene. Today’s guest, Max Tegmark, has thought a great deal about both of those ideas, as well as a more ambitious and speculative one: the Mathematical Multiverse, in which we imagine that every mathematical structure is real, and the universe we perceive is just one such mathematical structure. And there’s yet another possibility, that what we experience as “reality” is just a simulation inside computers operated by some advanced civilization. Max has thought about all of these possibilities at a deep level, as his research has ranged from physical cosmology to foundations of quantum mechanics and now to applied artificial intelligence. Strap in and be ready for a wild ride. Max Tegmark received his Ph.D. in physics from the University of California, Berkeley. He is currently professor of physics at the Massachusetts Institute of Technology. He has played an important role analyzing data from large-scale structure and the cosmic microwave background. He is the author of  Our Mathematical Universe  and  Life 2.0: Being Human in the Age of Artificial Intelligence.  He is a co-founder of the Foundational Questions Institute and the Future of Life Institute.

An infinite number of things happen; we bring structure and meaning to the world by making art and telling stories about it. Every work of literature created by human beings comes out of an historical and cultural context, and drawing connections between art and its context can be illuminating for both. Today’s guest, Stephen Greenblatt, is one of the world’s most celebrated literary scholars, famous for helping to establish the New Historicism school of criticism, which he also refers to as “cultural poetics.” We talk about how art becomes entangled with the politics of its day, and how we can learn about ourselves and other cultures by engaging with stories and their milieu. Support Mindscape on 

Changing technologies have always affected how we produce and enjoy art, and music might be the most obvious example. Radio and recordings made it easy for professional music to be widely disseminated, but created a barrier to its creation. Nowadays computers are helping to reverse that trend, allowing casual users to create slick songs of their own. Not everyone is equally good at it, however; Grimes (who currently goes by c , the symbol for the speed of light) is a wildly successful electronic artist who writes, produces, performs, and sings her own songs. We dig into how music is made in the modern world, but also go well beyond that, into artificial intelligence and the nature of digital/virtual/online personae. We talk about the birth of a new digital avatar -- who might be called "War Nymph"? -- and how to navigate the boundaries of art, technology, fashion, and culture. Her new album

Maxwell's Demon is a famous thought experiment in which a mischievous imp uses knowledge of the velocities of gas molecules in a box to decrease the entropy of the gas, which could then be used to do useful work such as pushing a piston. This is a classic example of converting information (what the gas molecules are doing) into work . But of course that kind of phenomenon is much more widespread -- it happens any time a company or organization hires someone in order to take advantage of their know-how. César Hidalgo has become an expert in this relationship between information and work, both at the level of physics and how it bubbles up into economies and societies. Looking at the world through the lens of information brings new insights into how we learn things, how economies are structured, and how novel uses of data will transform how we live. Support Mindscape on