124 | Solo: How Time Travel Could and Should Work

124 | Solo: How Time Travel Could and Should Work

Time! It doesn't stop, psychological effects of being under lockdown notwithstanding. How we experience time depends on our situation, but time itself just marches forward. Unless, of course, it's possible to travel to the past, as countless science-fiction scenarios have depicted. But does that really make sense? Couldn't we then change the past, even so dramatically that our own existence would never have happened? In this solo podcast I talk about both the physics and fiction of time travel. I point out that it might be allowed by the laws of physics, and explain how that would work, but that we really don't know. And I try to make sense of some of the less-sensible depictions of cinematic time travel. Coming up with a logical theory that could account for Back to the Future isn't easy, but podcasting isn't for the squeamish.

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But wait, there's more! I was contacted by Janna Levin, who we fondly remember from Episode 27. Janna moonlights as Chair and Director of Sciences at Pioneer Works, an institution dedicated to bringing together creative people in art and science. Like the rest of us, they've been looking for ways to offer more online content in these pandemic times, so we thought about ways to collaborate. Here's what they came up with: artist Azikiwe Mohammed has created an animated video backdrop to this podcast episode. The visuals are trippy, colorful, and inspired by (without trying to directly illustrate) what I talk about in the episode. You can check out a brief write-up at the Pioneer Works site, or view the video directly below.

https://www.youtube.com/watch?v=kHy1j4LiyGQ

Jaksot(416)

100 | Solo | Life and Its Meaning

100 | Solo | Life and Its Meaning

A podcast only hits the century mark once! And for Mindscape, this is it. There have been holiday messages and bonus episodes and the like. But this is the 100th officially-numbered episode. To celebr...

8 Kesä 20201h 33min

99 | Scott Aaronson on Complexity, Computation, and Quantum Gravity

99 | Scott Aaronson on Complexity, Computation, and Quantum Gravity

There are some problems for which it's very hard to find the answer, but very easy to check the answer if someone gives it to you. At least, we think there are such problems; whether or not they reall...

1 Kesä 20201h 52min

98 | Olga Khazan on Living and Flourishing While Being Weird

98 | Olga Khazan on Living and Flourishing While Being Weird

Each of us is different, in some way or another, from every other person. But some are more different than others — and the rest of the world never stops letting them know. Societies set up "norms" th...

25 Touko 20201h 1min

97 | John Danaher on Our Coming Automated Utopia

97 | John Danaher on Our Coming Automated Utopia

Humans build machines, in part, to relieve themselves from the burden of work on difficult, repetitive tasks. And yet, despite the fact that machines are everywhere, most of us are still working prett...

18 Touko 20201h 22min

96 | Lina Necib on What and Where the Dark Matter Is

96 | Lina Necib on What and Where the Dark Matter Is

The past few centuries of scientific progress have displaced humanity from the center of it all: the Earth is not at the middle of the Solar System, the Sun is but one star in a large galaxy, there ar...

11 Touko 20201h 21min

95 | Liam Kofi Bright on Knowledge, Truth, and Science

95 | Liam Kofi Bright on Knowledge, Truth, and Science

Everybody talks about the truth, but nobody does anything about it. And to be honest, how we talk about truth — what it is, and how to get there — can be a little sloppy at times. Philosophy to the re...

4 Touko 20201h 35min

94 | Stuart Russell on Making Artificial Intelligence Compatible with Humans

94 | Stuart Russell on Making Artificial Intelligence Compatible with Humans

Artificial intelligence has made great strides of late, in areas as diverse as playing Go and recognizing pictures of dogs. We still seem to be a ways away from AI that is "intelligent" in the human s...

27 Huhti 20201h 27min

93 | Rae Wynn-Grant on Bears, Humans, and Other Predators

93 | Rae Wynn-Grant on Bears, Humans, and Other Predators

Human beings have a strange fascination with dangerous, predatory animals — bears, lions, wolves, sharks, and more. The top of the food chain is an interesting and precarious place to live; while you ...

20 Huhti 20201h 2min

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