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

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281 | Samir Okasha on the Philosophy of Agency and Evolution

281 | Samir Okasha on the Philosophy of Agency and Evolution

Just like with physics, in biology it is perfectly possible to do most respectable work without thinking much about philosophy, but there are unmistakably foundational questions where philosophy becom...

1 Juli 20241h 11min

280 | François Chollet on Deep Learning and the Meaning of Intelligence

280 | François Chollet on Deep Learning and the Meaning of Intelligence

Which is more intelligent, ChatGPT or a 3-year old? Of course this depends on what we mean by "intelligence." A modern LLM is certainly able to answer all sorts of questions that require knowledge far...

24 Juni 20241h 41min

279 | Ellen Langer on Mindfulness and the Body

279 | Ellen Langer on Mindfulness and the Body

For those of us who are not dualists, the mind arises from our physical bodies -- mostly the brain, but the rest of the body has a role to play. And yet it remains tempting to treat the mind as a thin...

17 Juni 20241h 11min

278 | Kieran Healy on the Technology of Ranking People

278 | Kieran Healy on the Technology of Ranking People

We claim to love all of our children, friends, and students equally. But perhaps deep down you assign a ranking to them, from favorite to not-so-favorite. Ranking and quantifying people is an irresist...

10 Juni 20241h 15min

AMA | June 2024

AMA | June 2024

Welcome to the June 2024 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patreo...

3 Juni 20243h 58min

277 | Cumrun Vafa on the Universe According to String Theory

277 | Cumrun Vafa on the Universe According to String Theory

String theory, the current leading candidate for a theory of quantum gravity as well as other particles and forces, doesn't connect directly to the world we see. It's possible that there is a large la...

27 Maj 20241h 22min

276 | Gavin Schmidt on Measuring, Predicting, and Protecting Our Climate

276 | Gavin Schmidt on Measuring, Predicting, and Protecting Our Climate

The Earth's climate keeps changing, largely due to the effects of human activity, and we haven't been doing enough to slow things down. Indeed, over the past year, global temperatures have been higher...

20 Maj 20241h 19min

275 | Solo: Quantum Fields, Particles, Forces, and Symmetries

275 | Solo: Quantum Fields, Particles, Forces, and Symmetries

Publication week! Say hello to Quanta and Fields, the second volume of the planned three-volume series The Biggest Ideas in the Universe. This volume covers quantum physics generally, but focuses espe...

13 Maj 20242h 12min

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