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

Episoder(417)

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39 | Malcolm MacIver on Sensing, Consciousness, and Imagination

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38 | Alan Lightman on Transcendence, Science, and a Naturalist's Sense of Meaning

38 | Alan Lightman on Transcendence, Science, and a Naturalist's Sense of Meaning

Let's say, for sake of argument, that you don't believe in God or the supernatural. Is there still a place for talking about transcendence, the sacred, and meaning in life? Some of the above, but not ...

18 Mar 20191h 16min

37 | Edward Watts on the End of the Roman Republic and Lessons for Democracy

37 | Edward Watts on the End of the Roman Republic and Lessons for Democracy

When many of us think "Ancient Rome," we think of the Empire and the Caesars. But the Empire was preceded by the Roman Republic, which flourished for a full five centuries. Why, after such a long and ...

11 Mar 20191h 31min

36 | David Albert on Quantum Measurement and the Problems with Many-Worlds

36 | David Albert on Quantum Measurement and the Problems with Many-Worlds

Quantum mechanics is our best theory of how reality works at a fundamental level, yet physicists still can't agree on what the theory actually says. At the heart of the puzzle is the "measurement prob...

4 Mar 20191h 42min

35 | Jessica Yellin on The Changing Ways We Get Our News

35 | Jessica Yellin on The Changing Ways We Get Our News

Everything we think about the world outside our immediate senses is shaped by information brought to us by other sources. In the case of what's currently happening to the human race, we call that info...

25 Feb 20191h 8min

34 | Paul Bloom on Empathy, Rationality, Morality, and Cruelty

34 | Paul Bloom on Empathy, Rationality, Morality, and Cruelty

Within every person's mind there is on ongoing battle between reason and emotion. It's not always a battle, of course; very often the two can work together. But at other times, our emotions push us to...

18 Feb 20191h 10min

33 | James Ladyman on Reality, Metaphysics, and Complexity

33 | James Ladyman on Reality, Metaphysics, and Complexity

Reality is a tricky thing. Is love real? What about the number 5? This is clearly a job for a philosopher, and James Ladyman is one of the world's acknowledged experts. He and his collaborators have b...

11 Feb 20191h 7min

32 | Naomi Oreskes on Climate Change and the Distortion of Scientific Facts

32 | Naomi Oreskes on Climate Change and the Distortion of Scientific Facts

Our climate is in the midst of dramatic changes, driven largely by human activity, with potentially enormous consequences for humanity and other species. That's why science tells us, anyway. But there...

4 Feb 20191h 10min

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