Pod Insights Short Wave Aha! The Power Of A Short Rest About this episode Since 2004, scientific research has shown that a full night of sleep may lend itself to a burst of insight in the morning https://pubmed.ncbi.nlm.nih.gov/14737168/. But what about the earlier stages of sleep? And what about just a nap? A research team based in Germany found that even a 20-minute nap could deliver a "eureka" moment, and published their findings in the journal PLOS Biology https://journals.plos.org/plosbiology/article?id=10.1371%2Fjournal.pbio.3003185&utm_source=pr&utm_medium=email&utm_campaign=plos006 this week.
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0:18 Speaker 01 You're listening to Short Wave from NPR.
0:24 Regina Barber? Hey, Short Wavers. Regina Barber here.
0:26 Speaker 01 And Emily Kwong.
0:27 Regina Barber? With our biweekly science news roundup, featuring my brother from the Pacific Northwest, Ari Shapiro from All Things Considered.
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0:36 Regina Barber? That's right.
0:37 Speaker 03 So good to be here, especially because I hear we've got a story about NAPS, which I just love, how they can help solve a problem.
0:44 Speaker 01 This podcast would not be made without NAPS. Yes, we also have a story on an important picture of an exoplanet.
0:52 Regina Barber? Yes, and how wildfires can impact water quality nearly a decade after they burn.
0:58 Speaker 01 All of that on this episode of Short Wave, science podcast from NPR.
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2:33 Regina Barber? All right, all right, where do you want to start?
2:35 Speaker 03 I love any reason to take a nap. Are you about to give me another reason? Pruned by science?
2:42 Speaker 01 It's your lucky day. You know how when you're stuck on a problem, the common wisdom is sleep on it?
2:46 Speaker 03 Yeah, sure, like you wake up and have some insight you didn't have when you went to bed.
2:50 Speaker 01 Yes, Ari, science backs this up. A full night of sleep may lend itself to a burst of insight. And a group of researchers in Germany wanted to know more about the stages of sleep involved in a eureka moment. Could a nap be enough to deliver us that aha?
3:05 Speaker 03 How do you actually measure a eureka moment scientifically?
3:09 Speaker 01 Yeah, good question. Okay, so researchers invited study participants to track a group of dots on a screen and decide whether the dots were generally moving towards one of the four corners of the screen.
3:21 Regina Barber? But there was a secret trick that made the task super easy. The correct response was paired with a color. Without knowing that trick, though, the task was kind of tough.
3:29 Speaker 01 So in the middle of the task, the researchers let the participants take a 20-minute break in a room with the lights off, seated upon the most comfortable IKEA chair that cognitive neuroscientist Anika Lurva could find.
3:41 Speaker 05 Yeah, we also told people to sleep 30% less the night before and not consume any caffeine before coming in at 1:00 PM.
3:48 Speaker 03 So very primed to fall asleep.
3:51 Regina Barber? Yeah, exactly. Participants were also hooked up to an electrode cap to measure their brain activity. Some stayed awake, some fell asleep, and then they were asked to return to the task and discovered something kind of amazing.
4:02 Speaker 01 Yeah, Ari, those who napped figured out the color trick at a higher frequency. And those who managed to enter the first phase of Deep sleep, known as the N2 phase, had the highest frequency of insight. Eighty-six percent of those deep sleepers had their eureka moment.
4:19 Speaker 03 So they cracked the color code, they solved the task, and they only napped for like 20 minutes max.
4:24 Regina Barber? Yeah, that's right.
4:25 Speaker 03 Amazing. So on the level of brain chemistry, how does deep sleep, even for a brief period of time, lead to these breakthroughs?
4:33 Speaker 01 Yeah, that's the next question this team and others want to investigate. Anika told me the leading theory is that deep sleep consolidates what you learned. So maybe in deep sleep, irrelevant synaptic connections are pruned away and relevant connections remain so that upon waking, that might set our brain up for a breakthrough.
4:51 Regina Barber? Yeah, but this theory, of course, would have to be like tested with more sleep research.
4:55 Speaker 03 Sign me up. I'm happy to be paid to sleep. Okay, next story. Gina, what is so special about this newborn baby distant planet?
5:02 Regina Barber? Yes. Okay, so it's a planet beyond our solar system. It's orbiting another star. That's what's called an exoplanet. And astronomers have found thousands of exoplanets before, but this one is special because, one, this exoplanet was actually seen in an image, which is really hard to do. And two, astronomers took this picture while the exoplanet was still in this leftover disk of gas and dust it was formed from. The researchers published this image in the journal Nature this week.
5:26 Speaker 01 Yeah, and astrophysicist Alicia Weinberger, who didn't work on this study, said the image helps clarify a big missing piece of the planet formation puzzle.
5:35 Speaker 06 We have only a few examples of stars that have both a disk and a planet, where we can really look at that interplay and how one is influencing the other.
5:45 Speaker 03 And so does this new evidence fit the conventional wisdom about how planets form?
5:49 Regina Barber? Yes, yeah. So scientists have a very good hypothesis that like planets form inside this disk of gas and dust. It's leftover from like the star forming, actually. And these discs look like pancakes of light around a very young star. That's why all the planets in our own solar system are in a plane. They came from a similar pancake.
6:07 Speaker 01 Yes, a very delicious pancake. But sometimes there are gaps in the discs that are thought to be created from planets forming. And until now, scientists haven't been able to capture a planet in a gap on camera.
6:20 Speaker 03 Now that it's been caught on camera, what can we learn about this exoplanet?
6:24 Regina Barber? We can learn about its atmosphere, for one, which tells us more about like what it's made out of. We've talked to multiple astrophysicists for this story, and they all think that this image is like just the beginning. That eventually the James Webb Space Telescope will reveal like the whole process of how a planet forms.
6:39 Speaker 03 Yet another insight, thanks to the James Webb Space Telescope, which is so much better than any that came before, huh?
6:44 Speaker 01 Yeah. So much. I mean, it's sensitive enough to get an image of an exoplanet this small, about 30% of the size of Jupiter. The exoplanet is still bigger than Earth, but photographing a planet formation this small is a step towards finding even smaller planets closer to the size of Earth in our galaxy.
7:01 Regina Barber? Yeah, and a planet closer to the size of Earth is more likely to be hospitable to life.
7:05 Speaker 03 Well, let's come back to Earth for our third and final story,
7:08 Regina Barber? Yeah.
7:09 Speaker 03 which is about how wildfires affect water quality. We heard about this a lot during the Southern California wildfires. What's the new insight here?
7:17 Speaker 01 Yes, so a study came out this week in the journal Nature Communications and Environment, which suggests that water impacts can linger nearly a decade after wildfire flames die down, especially when it comes to contaminants left behind by the fires, like sediment or nitrogen.
7:35 Speaker 03 A decade's a long time. How did they figure that out?
7:37 Regina Barber? Yeah, the researchers analyzed hundreds of watersheds and compared areas that have been burned in wildfires to areas that were unburned, but they used data from across four decades. They collected data between 1984 and 2021, which is a big deal since like most wildfire studies have looked at a smaller window of time, two to three years like after a fire.
7:57 Speaker 01 And a watershed, by the way, they're very important. It's an area of land that collects water from rain or snowmelt and eventually channels water into a larger body, like a reservoir. Watersheds provide around two-thirds of the US population's clean water supply.
8:11 Speaker 03 So knowing the state of a watershed could be a good way to measure the aftermath of a fire.
8:16 Speaker 01 Yes, exactly.
8:17 Speaker 03 I know fires are becoming more intense and more frequent due to human-caused climate change. What kinds of contaminants are sticking around long after a fire?
8:25 Regina Barber? Yeah, the authors saw that carbon and phosphorus stuck around for up to like five years after a fire. While nitrogen and sediment were detected in the watersheds for up to eight years, all of which in excessive amounts can be harmful to humans and ecosystems.
8:38 Speaker 03 But public water utilities filter water before it reaches our faucets. So what does this mean for those of us who are, I don't know, taking showers and drinking water?
8:47 Speaker 01 Yeah, so one of the study authors, Ben Livner at University of Colorado Boulder, said that listeners shouldn't worry about water quality, but water utility companies should be extra aware of these contaminants for a long time after a wildfire takes place. They should perhaps pivot to use a new supply, depending on where the watershed is.
9:06 Regina Barber? Or use this information to be better prepared for future fires and help build water systems that are more resilient towards fire. And this data could help them do that.
9:14 Speaker 03 Which is going to be even more necessary as the planet heats up.
9:18 Regina Barber? Yeah, definitely. Thank you so much for hanging out with us.
9:21 Speaker 03 It's always so fun and educational.
9:28 Regina Barber? You can hear more of Ari Shapiro on Consider This, NPR's afternoon podcast about what the news means for you.
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9:47 Regina Barber? This episode was produced by Megan Lim and Rachel Carlson. It was edited by Rebecca Ramirez and Patrick Jaren Watanen.
9:54 Speaker 01 Tyler Jones checked the facts. Co-Takasugi Chernowen and Tiffany Vera Castro were the audio engineers. I'm Emily Kwong.
10:01 Regina Barber? And I'm Regina Barber. Thank you for listening to Short Wave, the science podcast from NPR.
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