Category: ScienceNews

Here on Short Wave, we're getting into the Halloween spirit a little early with a look at the world's oldest mummies. They're found in modern-day northern Chile. The mummies are well-preserved, so over the past 7,000 years, some have been exhumed for scientific study. But recently, something startling happened: Some of the mummies started to decompose.

Today on the show, Regina G. Barber talks to archeologist Marcela Sepulveda about the civilization that made these mummies: the Chinchorro people. We dig into the science behind their mummification techniques and how the changing planet is affecting archeologists' ability to study the past.

Fascinated by a science mystery? Send us your tales — we're at shortwave@npr.org.

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On his institutional web homepage at the University of California-Los Angeles’s Anderson School of Management, psychologist Hal Hershfield posts one statement in big italic type: “My research asks, ‘How can we help move people from who they are now to who they’ll be in the future in a way that maximizes well-being?”

In this Social Science Bites podcast, Hershfield and interviewer Dave Edmonds discuss what that means in practice, whether in our finances or our families, and how humans can make better decisions. Hershfield’s new book, Your Future Self: How to Make Tomorrow Better Today, offers a popular synthesis of these same questions.

Much of his research centers on this key observation: “humans have this unique ability to engage in what we call ‘mental time travel,’ the ability to project ourselves ahead and look back on the past and even project ourselves ahead and look back on the past while we're doing so. But despite this ability to engage in mental time travel, we don't always do it in a way that affords us the types of benefits that it could.”

Those benefits might include better health from future-looking medical decisions, better wealth thanks to future-looking spending and savings decisions, or greater contentment based on placing current events in a future-looking context. Which begs the question – when is the future?

 “The people who think the future starts sooner,” Hershfield explains, “are the ones who are more likely to do things for that future, which in some ways makes sense. It's closer, it's a little more vivid. There's a sort of a clean break between now and it. That said, it is a pretty abstract question. And I think what you're asking about what counts in five years, 10 years, 20 years? That's a deeper question that also needs to be examined.”

Regardless of when someone thinks the future kicks off, people remain acutely aware that time is passing even if for many their actions belie that. Proof of this comes from studies of how individual react when made acutely aware of the advance of time, Hershfield notes. “People place special value on these milestone birthdays and almost use them as an excuse to perform sort of a meaningfulness audit. of their lives, … This is a common finding, we've actually found this in our research, that people are more likely to do these sorts of meaning-making activities as they confront these big milestones. But it's also to some degree represents a break between who you are now and some future person who you will become.”

Hershfield concludes the interview noting how his research has changed him, using the example of how he now makes time when he might be doing professional work to spend with his family. “I want my future self to look back and say, ‘You were there. You were present. You saw those things,’ and not have looked up and said, ‘Shoot, I missed out on that.’ I would say that's the main way that I've really started to shift my thinking from this work.”

A new robot is designed to sink sargassum before the stinky seaweed comes ashore. Blooms of sargassum, a leafy brown seaweed, have increased in size and number over the past decade. As the blooms have grown, so too has their impact on coastal communities. The stinky seaweed can wreck local economies and ecosystems — and even threaten human health, some research suggests. But the creators of the AlgaRay say that their robot might do more than halt this damage. It could also fight climate change.

This week NPR is doing something new — dedicating an entire week to stories and conversations about the search for climate solutions. Head to npr.org/climateweek for more stories of solutions.

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It's pretty obvious to each of us that we are conscious, as we go about our days and feel the experience of just ‘being ourselves'. But how do we know that someone else is conscious?

It’s something we lose during dreamless sleep, under anaesthesia or in a coma. But what exactly is consciousness? On the one hand, it’s pretty obvious - it’s what we all feel as we go about our daily lives. It's the experience of 'being you'. On the other hand, it gets pretty tricky when we try to pin down the science of it all. How do we know that someone (or something) else is conscious?

CrowdScience listener Sylvester was wondering about this and he got in touch with a few questions on the subject. What is the relationship between our consciousness and reality? Is it all just a hallucination? When does it start and stop? Does consciousness reside in a particular part of the brain?

Host Marnie Chesterton sets out to tackle this elusive but utterly fundamental quality of life and sees how researchers are attempting to conceptualise and study it.

In the relatively young field of consciousness multiple theories have emerged. A new way of testing them - an adversarial collaboration - is offering a novel approach to not just consciousness research but science more broadly. We visit one lab in Frankfurt that's running experiments for the most recent adversarial collaboration and trying to test two theories of consciousness – Global Neuronal Workspace Theory (GNW) and Integrated Information Theory (IIT) – against each other.

Looking at these and other concepts of consciousness like Qualia, Marnie tries to understand this central tenet of our human experience that, in many ways, remains one of the great mysteries of science.

Presenter: Marnie Chesterton Producer: Sam Baker Editor: Richard Collings Production Coordinator: Jonathan Harris Studio Manager: Sarah Hockley Featuring:

Anil Seth, Sussex Centre for Consciousness Science, University of Sussex in Brighton, England Lucia Melloni, Max Planck for Empirical Aesthetics in Frankfurt, New York University & Project Lead for COGITATE Nao Tsuchiya, Monash Data Futures Institute, Turner Institute for Brain & Mental Health, Monash University

(Image: Active Human Brain. Credit: PM Images / Getty Images)

A tiny worm that regenerates entire organs. A South American snail that can regrow its eyes. A killifish that suspends animation in dry weather and reanimates in water. These are the organisms at the heart of regeneration science. But exactly how they do these things is still a mystery to scientists. Today on the show, Regina G. Barber talks to microbiologist Alejandro Sánchez Alvarado about this mystery. They get into what regeneration looks like, why humans can't do it (yet) and where the science may lead us in the decades to come.

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What did a 465-million-year-old trilobite eat for dinner? And how can we possibly know? Archaeologist Per Ahlberg has used x-ray to peer into the guts of one ancient scuttling creature and worked out what it what was munching on in its final moments.

From life in ancient earth rocks to potential life in space rocks, mineralogist and astrobiologist Bob Hazen has been training AI to spot signatures of life on Earth. He now hopes to use this tool on space samples.

We also ask experimental particle physicist Jeffrey Hangst how antimatter, the last mystery of the universe, responds to gravity - was Einstein's theory of general relativity right?

And the antiviral Covid medication, Molnupiravir, may be causing the virus to mutate. Theo Sanderson discusses how he figured this out and how concerned we should be.

Presenter: Roland Pease Producer: Ella Hubber Editor: Martin Smith Production co-ordinator: Jana Bennett-Holesworth

(Image: Fig. 1: Bohemolichas incola (Barrande, 1872). Credit: Kraft et al)

This week on the show that brings you the science behind the news, there are lots of stories about inflation in economies across the world. When inflation happens your money doesn’t go as far, so what does psychology say about how much money you really need to make you happy?

We humans aren’t the only ones experiencing inflation either, trees are suffering from it too. We find out what happens when the balance of supply and demand of nutrients between trees and fungi is disrupted by climate change.

And then we take a look at the bigger picture - the much bigger picture - as cosmologist Ghazal Geshnizjani tells us about how the entire universe once existed in a space smaller than a marble.

Plus, are Romanian bear populations inflating? We probe a scientist about spider webs – why do they look the way they do? And we look at vaping – it’s illegal in some countries while smokers in other countries are encouraged to take it up.

All that plus your emails, WhatsApps and some unexpected elephants.

Presenter: Caroline Steel, with Godfred Boafo and Andrada Fiscutean.

Produced by Ben Motley, with Alex Mansfield, Sophie Ormiston and Margaret Sessa Hawkins.

In 2016, NASA launched a spacecraft to do something rarely attempted before: Collect space rocks from a potentially dangerous asteroid. The mission, named OSIRIS-REx, was successful. Tuesday, scientists opened a sealed canister containing the samples from the asteroid Bennu. Science correspondent Nell Greenfieledboyce talks to host Regina G. Barber about the mission's close calls and what NASA might learn from these space rocks that are older than our planet.

Listen to Short Wave on Spotify, Apple Podcasts and Google Podcasts.

Have a space mystery? Send us your questions to shortwave@npr.org.

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Ever had an itch you can't scratch? It can be maddening. And even though itch has a purpose — it's one of our bodies' alert systems — it can also go very wrong. Dermatologist Dr. Shawn Kwatra talks to host Regina G. Barber about the science of why and how we get itchy, the mysteries behind chronic itch and how his own experience with eczema, hives and seasonal allergies helps him connect with his patients.

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Philosophers have long pondered the concept of a brain in a jar, hooked up to a simulated world. Though this has largely remained a thought experiment, CrowdScience listener JP wants to know if it might become reality in the not-too-distant future, with advances in stem cell research.

In the two decades since stem cell research began, scientists have learned how to use these cells to create the myriad of cell types in our bodies, including those in our brains, offering researchers ways to study neurological injuries and neurodegenerative disorders. Some labs have actually started 3D printing stem cells into sections of brain tissue in order to study specific interactions in the brain. Human brain organoids offer another way to study brain development and diseases from autism to the Zika virus.

So, might stem cell research one day lead to a fully-grown human brain, or is that resolutely in the realm of science fiction? If something resembling our brains is on the horizon, is there any chance that it could actually become conscious? And how would we even know if it was?

Host Marnie Chesterton takes a peek inside the human brain and speaks with leading scientists in the field, including a philosopher and ethicist who talks about the benefits – and potential pitfalls – of growing human brain models. Along the way, we'll pull apart the science from what still remains (at least for now) fiction.

Presenter: Marnie Chesterton Producer: Sam Baker Assistant Producer: Jonathan Blackwell Editor: Richard Collings Production Coordinator: Jonathan Harris Studio Manager: Jackie Margerum

(Image: Brain in a jar. Credit: Mike Kemp / Getty Images)