ToKCast

Latest Episodes:

Ep 81: "The Science of Information" (Chiara Marletto's "The Science of Can & Can't" (A prelude to Ch 3) Aug 06, 2021

Show notes

In this the fourth episode about Chiara Marletto's excellent work "The Science of Can and Can't" I discuss the science of information. Chapter 3 of the book is called "Information" but in this episode I do not actually read from the book. This is a broader overview of issues in epistemology, folk philosophy, physics and mathematics that have some connection to the topic of "information". I thought these might be useful contextual remarks before leaping into reading the book. That will happen next episode. Quite a few images and I move through a mathematical problem at one point on the screen which may be difficult given audio only. The video version is here: https://www.youtube.com/watch?v=s8uTVbdjMy8

Ep 80: David Deutsch's "The Fabric of Reality" Chapter 2 “Shadows” Jul 19, 2021

Show notes

In this episode, I read David’s explanation of the multiverse and make some remarks on it. This, more than anything in my actual physics lessons, helped me *understand* quantum theory. This, in a sense, is the “abridged” version of my multiverse series found here: https://www.youtube.com/watch?v=e6C_K18A4f8&list=PLsE51P_yPQCQqJDb65AIVLads8PKxYuPm which I recommend for anyone who wants more details.

If you would like to support me, find me on Patreon: https://www.patreon.com/BrettRHall or donate via Paypal. Link on my website at www.bretthall.org

Ep 79: David Deutsch answers a question about our environment. A question for David 5. Jul 16, 2021

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In this question we discuss Stephen Hawking's claim that people are "chemical scum" on a typical planet orbiting a typical star in a typical galaxy and so on. How suitable is our planet for life, actually? How suitable is it for people in particular?

Ep 78: ToKCast's "Do Explain" Part 1 Jul 07, 2021

Show notes

This interview can, in its original form be found here: https://www.youtube.com/watch?v=A6MEgZ4f7Bw

“Do Explain” is a podcast interview series created by Christofer Lövgren (Chris as I call him because I can’t pronounce his surname). Find “Do Explain” anywhere podcasts can be found - for example Apple here: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjr6PqYvdDxAhVbb30KHb_dDwMQFjAMegQIAxAD&url=https%3A%2F%2Fpodcasts.apple.com%2Fus%2Fpodcast%2Fdo-explain-with-christofer-l%25C3%25B6vgren%2Fid1482313214&usg=AOvVaw0G27IzC-h5LsxVAY3_tY44 or “Tune In” here https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjr6PqYvdDxAhVbb30KHb_dDwMQFjACegQIBRAD&url=https%3A%2F%2Ftunein.com%2Fpodcasts%2FEducation-Podcasts%2FDo-Explain-p1284002%2F&usg=AOvVaw2LktTeYavrEMGpDDG7xC4r

The main website and host for Do Explain for now is here: https://doexplain.buzzsprout.com

Ep 77: David Deutsch's "The Fabric of Reality" Chapter 1 "The Theory of Everything" Part 3 Jul 05, 2021

Show notes

In this, the third part discussing the first chapter of "The Fabric of Reality" we speak more about reductionism. In particular we look at the limitations of the traditional conception of physics and how attempts to make breakthroughs in fundamental physics tend not to rely on a completely new "mode of explanation". We speak about unifications and all of this is very much a prelude - clues here for the taking - of "Constructor Theory". I provide a quick overview of "the relativity of simultaneity" where I am suggesting that the "in principle" claim to be able to have a predictive theory even in physics seems to me to be a dead end. There is genuine creativity in the world - things that cannot be predicted. But even taking the laws of physics as they are seriously, seems to put a boundary on the knowledge we would need in order to make even a reductive prediction. Some more comments on logical positivism, instrumentalism and Wittgenstein. The Nexus: https://www.youtube.com/watch?v=zpTxBkmr4LE In this video I mention the work of physicist Sam Kuypers. He gives a talk on non-commuting qubits here: https://www.youtube.com/watch?v=nY0LauOLR70

Ep 76: David Deutsch and Tyler Cowen: Reaction Jul 01, 2021

Show notes

The video I am responding to is here: https://www.youtube.com/watch?v=b_6vY... which is on the @Mercatus Center channel with Tyler Cowen. The original is well worth watching in its entirety. My response does not do it justice and is just intended as a supplement for those who have watched the whole thing and might have some questions at the end about various parts. I’m not pretending to speak for David - I’m just giving my own perspective given my understanding of what I’ve read in, for example, “The Beginning of Infinity”. Tyler Cowen does a fantastic job here of questioning David and articulating what are some of the frequently heard objections about this world view. It is, for example, common to hear something between a denigration to a downplaying of the importance of Popper especially among academic types. David provides an excellent explanation of Popper and I have a few things to say about that myself.

Ep 75: It's not scientific and it's not American Jun 25, 2021

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With a special introduction for audio only listeners, here in this "rather different" episode, I've tried tapping in to my inner Douglas Murray to summon the right level of outrage. This is about as angry as I get. I’m essentially reading through and responding to this “Scientific American” article (which has nothing scientific nor American about it) https://www.scientificamerican.com/ar... with some supplementary remarks about a “Nature” article which goes a long way towards rubbishing the good name of that great journal: https://www.nature.com/articles/s4146... If you’re not in agreement with the articles you might appreciate trading my time spent making this defence of freedom, free trade and progress with some of your own money here: https://www.patreon.com/tokcast or here for a monthly contribution: https://www.patreon.com/BrettRHall or on my website click “Donate” to make a one off contribution www.bretthall.org

Ep 74: Chiara Marletto's "The Science of Can and Can't" Episode 3 Jun 25, 2021

Show notes

This episode covers chapter 2 titled "Beyond Laws of Motion?". In this chapter we explain some of the successes of the "dynanical laws + supplementary conditions" vision of physics and some of the limitations. Those limitations include the fact that the supplementary conditions - notably the initial conditions - cannot be explained under that scheme. Nor can time itself. The idea of things being possible or impossible in the universe (for example computers) may better be understood via constructor theory and there is more grist-for-my-mill when I get back on my hobbyhorse about free will (to mix some metaphors).

Ep 73: David Deutsch on "Truth". A question for David 4. Jun 24, 2021

Show notes

This is a question for David about Popper's notion of "verisimilitude". Can we utter the truth? What does David think about probability? Two excellent talks by David referred to in this video are the one he did on "Statements, Propositions and Truth" with the Oxford Karl Popper Society https://www.youtube.com/watch?v=DZ-opI-jghs and the one on Probability (which is somewhat misleadingly titled "David Deutsch on Physics Without Probability" - it's actually far broader than this and should be required viewing for anyone who thinks they already understand lots about probability. After this, they might need to rethink their life ;) https://www.youtube.com/watch?v=wfzSE...

Ep 72: David Deutsch comments on recent UFO sighting (The "Tictac" issue). A question for David 3. Jun 23, 2021

Show notes

Yes, this is me asking David Deutsch about the supposed "evidence" of UFOs that are the US Military's release of footage from jet aircraft that have become known as "Tic Tacs". I do not mention this in the video, but the best explanation I have seen of at least some of this stuff is by Mick West who was able to reproduce at least some of the images: https://www.youtube.com/watch?v=Le7Fq... Neil deGrasse Tyson also makes broadly similar remarks to David in this podcast with Sam Harris: https://www.youtube.com/watch?v=VBVg5... Whatever the case, the deeper point is the more general one. When we do not know the explanation for a set of observations, then we have a problem. Not a solution. In this case, we seem to have either very prosaic solutions (as Mick West explains - in the form of camera effects) or perhaps something we "don't know". What we do not have is "evidence for" something amazing. Namely alien life visiting us in their spacecraft. The only way "evidence for" actually works is when it *rules out* every other theory. That is, in fact, the purpose of evidence in science. For more on that, see here: http://www.bretthall.org/general-rela... and here: http://www.bretthall.org/philosophy-o... #Tictacs #UFO

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