Short Wave - This Week In Science: Spiders, TV Pixels And Storytelling

Episode Date: October 31, 2025

Happy Halloween, Short Wavers! In today’s news round-up, we’ve got only treats. Hosts Regina Barber and Emily Kwong fill in NPR’s Ailsa Chang on a debate in spider web architecture, how the details shared in storytelling affect how you form memories and why more pixels may not translate to a better TV viewing experience.Have a science question? Email us your question at [e-mail] 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.See pcm.adswizz.com for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences.NPR Privacy Policy

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Oh, that's so nice. Mr. Shue, thank you. I've been making this show since 2019, and our whole team really loves this work. So take a sec to tell us what you think, leave us a review and share Shortwave with your friends. All right, on to the show. You're listening to Shortwave, from NPR. Happy Halloween shortwavers, Regina Barber here. And Emily Kwong, it's our favorite holiday and one of our favorite segments, our biweekly Science News Roundup featuring the hosts of all things considered. And today we have the stylish, the funny Elsa. What are you going to be for Halloween this year, Elsa? I don't know. A sexy witch? I have no idea. Nice.

So what stories did you bring for us this week? Like, I hope at least one of them is spooky for Halloween. We would not fail you, Queen. We do have a story about why spiders decorate their webs. It's not just us is decorating this time. Yeah. Plus, how more pixels on your HDTV might not make a difference. Oh.

Yeah, buyer's remorse. And lastly, how your brain forms memories of different kinds of stories. Very cool. We've got tricks. We've got treats. We've got TV, my favorite thing. Yeah. You're listening to Shorewave, the science podcast from NPR.

Okay, Elsa, where do you want to start? Let's take spider webs first, just in time for Halloween. Yes. I want to talk about orb webs. That's the spider web that looks like a wheel with concentric circles of silk on the spokes. Yes. Yeah, they're so pretty. Yeah, and sometimes orb webs have these additional bits of silk called Stabilimenta,

which look like a zigzag of threads or a flattened disc decoration. Oh, I think I have seen these right before I've walked into a spider web with my face. Why are spiders decorating like that? Yeah, no one knows for sure. The Stabilimenta do reflect a wide range of lights, so there's an idea that they might help attract prey or deter predators. but it's a big debate among silk scientists. Talking, discussing about Stabilimenta for silk scientists is like picking up an easy fight. Even that word Stabilimenta sounds so beautiful.

This is Gabrielle Greco. He wanted to throw another idea into the debate ring. He's a physicist and lead author of a new paper in the journal Plus One, and he wondered if the Stabilimenta actually helps spiders locate their prey. I mean, that would be ingenious. Why would they need help, though? Well, spiders, many of them have low vision. They can't look across the web and see their prey.

Instead, they rely on the web's vibrations to sense dinner. So when a fly hits the web, the impact sends out waves in all directions, like a string of a guitar being strummed. And that lets the spider know where their dinner has landed. And Gabriela wanted to know if the decorations helped in any way with wave propagation. That is fascinating. And how did he go about testing that? His team ran simulations like modeled web vibrations with a computer and found that when vibrations moved perpendicular to the spoke, of the simulated web, the stabulamenta didn't make a difference. But when the vibrations

move parallel to the spiral threads of the web, the decorations did help. So the presence of the stabilamenta allowed the wave to travel farther. So they finally settled the debate. No, they actually complicated the debate. Gabrielle recognizes his study has limits. It's just a simulation and real webs are much more complex. Outside researchers, including Xi Tang Zhang, an ecologist at Hubei University noted the study lacks behavioral data from real spiders. So to figure out if there's some kind of mechanical purpose for this to bilimenta, Gabriale plans to do more research, both in the lab and in the field. So cool.

Okay, next up, tell me about the study about pixels on my TV. Yeah, so a team from the university. Did I buy the wrong TV? We'll get there. Don't worry. So a team from the University of Cambridge in the UK decided to ask the question, like how many pixels on your high-definition TV, or really any display, is too many. So pixels being that smallest unit of a digital image, that tiny colorful square.

So researchers had 18 people look at images on an adjustable display to see if they could distinguish between different resolutions or level of detail. And what they determined is that there is a limit. A limit? Wait, what does that mean? Like, are certain fancy TVs with a ton of pixels just not worth it? So it depends. So keep in mind there's so many factors that matter here. So we talked to Malija Ashraf about it and she's a human vision. researcher and lead author of the study published in the journal Nature Communications. The number of pixels by itself doesn't mean a lot, but rather when you put it into context with the viewing distance and also how large the screen is, so what matters is pixel density.

Pixel density, that's pixels per square inch. So a 4K TV has 4,000 pixels in a line across the screen, but screens come in different sizes. 4,000 pixels could be packed into a 55-inch TV or a 70-inch TV. And that will be. affect your viewing experience. So also like say your dad just bought a new 80 inch TV that is 8K, that's 8,000 pixels across the screen, but he watches it from 10 feet away in a big room. That means he paid too much. He does not need something that powerful. My dad never wants to pay too much for anything. So he would be mad at this. I wonder if my TV though at my house in Los Angeles has too many pixels for me to notice. Yeah. So this is what I was worried about.

I just bought a 65-inch TV, and it's the most I've ever spent on a TV, and I was dying to know, did I waste money? I brought it up to Malija and Rafael Montouk, one of the other co-authors. They ran my TV specs through their calculator. I sit about seven feet away. And I would say that you are exactly where you should be in terms of viewing distance. So I think that was the perfect fit for your viewing environment. Nice. Validated.

Good job, Gina. So lesson here, don't just buy a super-met. megapixel TV because it's the newest model or highest resolution yet. Talk to the people at the store. Tell them the viewing distance in your TV room and buy something that actually fits your needs. Yeah. And Elsa, if you're wondering why computer scientists are so interested in TVs, we should note that this study was funded by meta because those sorts of insights are also like really important for people who make like VR goggles, 3D images, this new generation of technology for our eyes. Yeah. Okay. Well, for our third topic, story. and the brain. I feel like NPR would be very interested in this, Gina. Yeah. So there's a new study out this month in the Journal of Neuroscience that suggests the way a story is told changes how the memory of that story forms in the human brain.

Okay. So explain this a little bit to me. You're saying that different versions of the same story might activate my brain in different ways. Yes, exactly. And to figure that out, researchers put participants in MRI machines and told them stories while looking at their brains. So all the participants heard a story about going out to eat with a line that read. Once I was ready to go, I took an Uber to meet my friend at the restaurant. That's Charles Ferris, a cognitive neuroscientist and one of the study authors. And he says from there, researchers changed the details. In some cases, they also told the stories with extra sensory details like, I saw my phone light up on the desk in my room many times.

My friend kept texting me to ask where I was. I noticed a scuff mark on my blue shoes as I walked down my staircase towards the front door. Yeah, you can almost picture the story, right? Like hearing those details. And with this version of the story, researchers saw more connections between the hippocampus. That's an area important for memory. And the area of the brain related to sensory integration and language processing. Okay, so that was the first version of this story.

What was the second version? The second version had more conceptual details instead. So like how the person was thinking or what they felt. I wanted to take my time getting ready because it was important to me to look nice for my friend. So these details are more related to the emotional context, right? And in this telling of the story, researchers then saw more connections between the hippocampus and areas of the brain related to emotion and conceptual processing. And what does it mean if memories are forming in different areas of the brain? So we asked Charon Ranganath, a neuroscientist at the University of California Davis. And he didn't work on this paper, but he does study memory. And he says the study offers two big takeaways. First, how interconnected the human brain actually is. The standard narrative in neuroscience has always been to focus on single brain areas. And something that these authors are showing is that, in fact, memory is this kind of richly orchestrated set of interactions across these brain regions.

And I wouldn't say this is the first to do this. But I think they do it really nicely here. And secondly, he says this study emphasized that even if the key details of a story are the same, Different ways of presenting that information could change the way a person processes it and possibly remembers it. All right. Note to self, storytellers. Elsa, thank you so much for being here. We hope you have the most fun Halloween. You too. And we also love having you on the pod.

I love being on your pod, guys. You can hear more of Elsa Chang on Consider This and PR's afternoon podcast about what the news means for you. This episode was produced by Brianna Scott and Rachel Carlson. It was edited by Rebecca Ramirez and Christopher and Taliyata. Tyler Jones checked the facts, Hannah Glovena, and co-Takusugi Chernivan, or the audio engineers. I'm Emily Kwong. And I'm Regina Barber. Thank you for listening to Shortwave, the science podcast from NPR.