Category: ScienceNews

An estimated 5-10% of the U.S. population experiences a disorder with their TMJ, the joint that connects their jaw to their skull. The good news? Relief is possible. The secret? Go see your dentist. Today on the show, Emily talks with Justin Richer, an oral surgeon, about the diagnosis and treatment of TMJ disorders.

Got a question about your teeth or dentistry? Email us at shortwave@npr.org.

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Electricity bills are on track to rise an average of 8 percent nationwide by 2030 according to a June analysis from Carnegie Mellon University and North Carolina State University. The culprits? Data centers and cryptocurrency mining. Bills could rise as much as 25 percent in places like Virginia. Science writer Dan Charles explains why electric utilities are adding the cost of data center buildings to their customers’ bills while the data companies pay nothing upfront. 

Read the full June analysis here.

To listen to more on the environmental impact of data centers, check out our two-part reported series:

- Why the true water footprint of AI is so elusive

- How tech companies could shrink AI's climate footprint

Interested in how technology affects everyday life? Email us your question at shortwave@npr.org.

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The comet 3I/ATLAS is taking a long holiday journey this year. It’s visiting from another solar system altogether. Those interstellar origins have the Internet rumor mill questioning whether 3I/ATLAS came from aliens. Co-hosts Emily Kwong and Regina G. Barber dive into that, plus what it and other interstellar comets can tell us about planets beyond our solar system.


Read more of NPR’s coverage of 3I/ATLAS. Also, if you liked this episode, check out our episodes on:

- the physics in the film Interstellar

- why Pluto is still helpful for learning how our solar system formed


Interested in more space science? Email us your question at shortwave@npr.org.


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What does your accent – and yes, every speaker has one – say about you? Or perhaps the better question is, what do others hear in your accent? These are the sorts of questions that Devyani Sharma, a professor of language and communication at Oxford's Worcester College, asks every day, especially about the many English speakers around the world.

In this Social Science Bites podcast, Sharma takes a deep dive into the accents of Britain, where accents have famously been used as markers of social status for years. As she tells interviewer David Edmonds, "the UK stands out as a country that's organized its whole social system around accent for a very long time."

While that's been true historically, Sharma's own research and public service – through projects like Generations of London English, Dialect Development and Style in a Diasporic Community, and the Accent Bias Britain online resource – has helped reduce the negatives around that.

As she details for Edmonds, "Interestingly, just a reminder that 'you might be relying on accent as a shortcut and please don't' was enough to change recruiters' behavior. It doesn't always happen with gender and race anymore, and my sense is that's because the message has been saturated. People are annoyed to be reminded before doing a recruiting task, but they haven't thought as much about how much they use accent when judging people."

Prediabetes is common in the U.S. — around 1 in 3 people have it. And many people may not know they have it. But last year, the FDA approved the first over-the-counter continuous glucose monitor. Since then, more people without diabetes have started checking their blood glucose levels. Diabetologist and University of California, San Francisco professor of medicine Dr. Sarah Kim shares the science behind blood glucose with host Emily Kwong. 


Check out more of NPR’s coverage about continuous glucose monitors.


Interested in more science of the human body? Email us your question at shortwave@npr.org.

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When listener Sakura’s husband came home from his morning walk in Cambridgeshire, UK, he told her about a massive rainbow he’d seen. But when he showed her a picture, she didn’t think it was particularly large. So how big is a rainbow really? Are they always the same size? And if some are bigger than others, is there a limit?

To find the answers, presenter Marnie Chesterton meets independent rainbow expert Philip Laven in a pitch-black studio to simulate how a rainbow is formed. He demonstrates how they are created by sunlight, reflecting and refracting in millions of little water droplets.

But what does that mean for their size? Raymond Lee, retired professor from the US Naval academy, says that rainbows are not objects and don’t have a linear size, just a specific angular size that’s relative to the person seeing it. But Marnie doesn’t give up so easily – some rainbows still look bigger than others.

In her journey to discover other ways to size up a rainbow, Marnie hears from Australian aerial photographer Colin Leonhardt who stunned the world with a beautiful picture. Next, assistant professor Ping Wah Li from The Chinese University of Hong Kong explains why it’s possible to come across more than one rainbow at a time.

And finally, atmospheric scientist Harald Edens shares another way to consider size, as well as how much he struggles to explain the complexity of rainbows to his four-year old daughter.

Presenter: Marnie Chesterton

Producer: Florian Bohr

Editor: Ben Motley

Photo: Rainbow of Dreams - stock photo stock photo Credit: Laurent Fox via Getty Images)

The Portrait of Elisabeth Lederer by Gustav Klimt has recently sold for $236m, making it the second-most expensive artwork ever sold at auction.

Inspired by this headline, the Unexpected Elements team delve into the story of how microbiology may have influenced Klimt’s work.

Speaking of microbiology, we find out that bacteria could help restore frescoes to their former glory.

We also get on the line with Dr Siyakha Mguni, an archaeologist and senior lecturer at the University of Cape Town, who tells us about ancient artworks far older than anything Klimt ever painted.

Plus, the world’s biggest spider’s web, and why mosquitoes are impressive 3D printers.

All that, plus many more Unexpected Elements.

Presenter: Marnie Chesterton, with Andrada Fiscutean and Edd Gent Producers: Alice Lipscombe-Southwell, with Margaret Sessa Hawkins, Alice McKee, Lucy Davies and Robbie Wojciechowski

How far back in evolutionary history does kissing go? Through phylogenetic analysis, an international team of scientists found that kissing was likely present in the ancestor of all apes – which lived 21 million years ago. Not only that: They were definitely kissing Neanderthals. The study was published in the journal Evolution and Human Behavior. In this news roundup, we also talk about new clues about the collision that created our moon and a moss surviving the hardships of space.

Interested in stories about human evolution? Email us your question at shortwave@npr.org.

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Many people are gearing up for holiday conversation with loved ones who may disagree with them -- on everything from politics to religion and lifestyle choices. These conversations can get personal and come to a halt quickly. But today on the show, we get into neuroscience and psychological research showing that as much as we disagree, there are ways to bridge these divides -- and people who are actively using these strategies well in their daily lives. (encore)

Want to hear more neuroscience and psychology? Email us your ideas to shortwave@npr.org — we'd love to hear from you!

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Their whole life, producer Hannah Chinn has known about the Big One: a massive earthquake forecasted to hit the West Coast. Scientists say it’ll destroy buildings, collapse bridges, flood coastal towns and permanently shift the landscape. But how exactly do scientists know this much about the scope of earthquakes if they can’t even predict when those earthquakes are going to happen? Together with host Emily Kwong, Hannah goes on a quest for answers. Plus, they get into what a Cascadia earthquake has in common with a Thanksgiving turkey.

This story is part of Nature Quest, our monthly segment that brings you a question from a Short Waver who is noticing a change in the world around them. Have an environment-based question you want us to investigate on the next Nature Quest? Email us your question at shortwave@npr.org.

Check out our previous episode on earthquake prediction.

Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave.

Listen to Short Wave on Spotify and Apple Podcasts.

This episode was produced by Hannah Chinn and Rachel Carlson. It was edited by Rebecca Ramirez. Tyler Jones checked the facts. The audio engineer was Kwesi Lee. Special thanks to scientists Paul Lundgren and Suzanne Carbotte.

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