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Within Reason

#119 Jim Al-Khalili - The Strange World of Quantum Physics

Within Reason

Alex J O'Connor

Religion, Morality, Ethics, Society & Culture, Cosmicskeptic, Religion & Spirituality, Philosophy

4.91.8K Ratings

🗓️ 1 September 2025

⏱️ 65 minutes

🧾️ Download transcript

Summary

Jim Al-Khalili is an Iraqi-British theoretical physicist and science populariser. He is professor of theoretical physics and chair in the public engagement in science at the University of Surrey. Learn more about your ad choices. Visit megaphone.fm/adchoices

Transcript

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0:00.0

Jim Alcalailly, welcome to the show. Pleasure to be here. Once upon a time when doing a lecture

0:06.0

at the Royal Institution, you spoke about the famous double split experiment, this strange quantum

0:12.9

phenomenon whereby something sort of appears to, light appears to act as a wave and a particle at the same time.

0:19.9

And you issued a challenge. You said, now, if anybody thinks that they can offer a common sensical explanation for this kind of thing, then do send me an email. How did that work out for you? I wish I hadn't done that. I'd forgotten that I wasn't just talking to the three or four hundred people in the audience at the Royal Institution.

0:40.8

But obviously it gets recorded and goes out on their YouTube channel.

0:43.8

To this day, I mean, that's about 10 years ago now.

0:48.4

To this day, I receive, on average, one or two emails a week from people saying,

0:50.8

I've solved the two slits mystery.

0:52.6

You know, where's my Nobel Prize?

0:57.1

No, we've tried that. Yeah. There's a lot that's strange about quantum mechanics. Maybe we'll get into a few more of those things later on. But

1:02.5

the American, the great American physicist Richard Feynman said that the two-slit experiment

1:09.1

is sort of encompasses the central mystery of quantum mechanics

1:13.2

that we know that if when you send light through to two slits and it's in you get interference

1:19.5

patterns light and dark fringes what's weird is that sending particles indeed even entire

1:25.1

atoms through you get the same wave-like behavior when you send

1:29.6

particles through. So I went through in this lecture, I went through how come, you know,

1:34.7

quantum mechanics is this wonderful, powerful theory that has revolutionized the world, helped

1:43.4

our understanding of the subatomic world, and yet at its heart

1:47.0

there's this counterintuitive idea manifesting in this two-slits experiment that we still can't

1:52.0

explain properly.

1:53.0

Yeah.

1:54.0

So quantum mechanics is stereotypically thought of as the sort of weird, spooky, kind of creepy, leaves room for

...

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