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Nature Podcast

07 May 2020: Galileo and the science deniers, and physicists probe the mysterious pion

Nature Podcast

podcast@nature.com

News, Science, Technology

4.5893 Ratings

🗓️ 6 May 2020

⏱️ 22 minutes

🧾️ Download transcript

Summary

This week, a new way to study elusive subatomic particles - pions, and the story of Galileo remains relevant in a time of modern science denialism.


In this episode:


00:46 Probing pions

Pions are incredibly unstable and difficult-to-study subatomic particles. Now researchers have come up with a clever way to examine them - by sticking them into helium atoms. Research Article: Hori et al.


08:28 Research Highlights

A colourful way to cool buildings, and the rapid expansion of cities. Research Highlight: A rainbow of layered paints could help buildings to keep their coolResearch Highlight: Urban sprawl overspreads Earth at an unprecedented speed


10:46 The life of Galileo

A new biography of Galileo Galilei examines some of the myths about his life and draws parallels with problems facing scientists today. Books and Arts: Galileo’s story is always relevant


16:42 Pick of the Briefing

We pick our highlights from the Nature Briefing, including botanical graffiti, and rock-eating bacteria. The Guardian: 'Not just weeds': how rebel botanists are using graffiti to name forgotten floraScientific American: Scientists Waited Two and a Half Years to See whether Bacteria Can Eat Rock

Subscribe to Nature Briefing, an unmissable daily round-up of science news, opinion and analysis free in your inbox every weekday.


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Transcript

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0:00.0

Nature.

0:02.0

In an experiment, I don't know yet.

0:06.0

Why is Blight so far?

0:08.0

Like, it sounds so simple.

0:09.0

They had no idea.

0:11.0

But now the data's...

0:12.0

I find this not only refreshing, but at some level astounding.

0:20.0

Nature.

0:25.6

Welcome back to the nature podcast.

0:31.6

This week, observing the strange subatomic particles called pions... And the life of Galileo Galilei.

0:33.6

I'm Charmoney Bundell.

0:35.6

And I'm Charmany Bundell and I'm Nicau.

0:53.0

First up on the show, pyons. Pyons are subatomic particles you might not have heard of,

1:13.6

even though they stream down from the atmosphere all the time. Like protons, they're made up of quarks, but while protons have three quarks, pions have just two, and that makes them both super unstable and reactive. On their own in a vacuum, a negatively charged pion might live for a few billionths of a second, but attempt to capture one in a material to study it and it reacts, disappearing in mere trillions of a second.

1:21.6

This week in nature, scientists have used an ingenious method to keep pylons around a little longer, by sticking

1:29.6

them into helium atoms. Though hypothesized to exist, the creation of pionic helium has never been

1:36.8

verified until now. Aside from being a bit weird, pionic helium is useful because it keeps the

1:44.0

troublesome pions alive long enough

1:45.8

to measure them using spectroscopy, and that could open up whole new avenues for research

1:51.7

into this elusive particle. Reporter Lizzie Gibney called up lead author Masaki Hori to find out more

1:58.2

and started by asking about why physicists thought pionic helium could be

2:02.2

created in the first place.

...

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