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New Zealand volcano deemed to have the status of personhood
New Zealand is the first country in the world to give natural geographic features the status of personhood, with all the rights of a human being. It was first done to Te Urewera, a remote area of the North Island, then to the North Island’s Whanganui River. Now CNN and Breaking Views (headlines below) report that personhood has been tranted to a third feature, the volcano Mount Taranaki, also on the North Island, and located here:
M.Bitton, CC BY-SA 4.0, via Wikimedia Commons
A bit about it from Wikipedia:
Taranaki Maunga, also known as Mount Egmont) is a dormant stratovolcano and legal person in the Taranaki region on the west coast of New Zealand’s North Island. At 2,518 metres (8,261 ft), it is the second highest mountain in the North Island, after Mount Ruapehu. It has a secondary cone, Fanthams Peak (Māori: Panitahi), 1,966 metres (6,450 ft), on its south side.
It’s a lovely mountain, and yet I didn’t see it when I visited the country a few years ago. Here are two photos from Wikipedia:
The caption for this one is: “Mount Taranaki (Mt Egmont), from Inglewood, New Zealand, 1896”
State Library of New South Wales, DL PX 150, Public domain, via Wikimedia Commons
Click on the headlines below to read. The first article is from CNN, the second from Breaking Views. Quotes will be from CNN unless indicated otherwise.
Although the mountain was apparently sacred to the indigenous Māori people (it was considered an “ancestor”), it was renamed and claimed by Europeans who colonized the country. When the Treaty of Waitangi was signed in 1840, ceding all Māori lands to their respective tribes (the treaty wasn’t signed by all indigenous tribes and has been subject to conflicting interpretations for nearly two centuries), the Māori could reasonably claim that the mountain had been stolen from them. On January 30, the New Zealand government redressed this appropriation by giving the mountain the same status as a human being. From CNN:
A mountain in New Zealand considered an ancestor by Indigenous people was recognized as a legal person on Thursday after a new law granted it all the rights and responsibilities of a human being.
Mount Taranaki — now known as Taranaki Maunga, its Māori name — is the latest natural feature to be granted personhood in New Zealand, which has ruled that a river and a stretch of sacred land are people before. The pristine, snow-capped dormant volcano is the second highest on New Zealand’s North Island at 2,518 meters (8,261 feet) and a popular spot for tourism, hiking and snow sports.
The legal recognition acknowledges the mountain’s theft from the Māori of the Taranaki region after New Zealand was colonized. It fulfills an agreement of redress from the country’s government to Indigenous people for harms perpetrated against the land since.
How can a mountain be a person?
The law passed Thursday gives Taranaki Maunga all the rights, powers, duties, responsibilities and liabilities of a person. Its legal personality has a name: Te Kāhui Tupua, which the law views as “a living and indivisible whole.” It includes Taranaki and its surrounding peaks and land, “incorporating all their physical and metaphysical elements.”
A newly created entity will be “the face and voice” of the mountain, the law says, with four members from local Māori iwi, or tribes, and four members appointed by the country’s Conservation Minister.
The vote on giving the mountain personhood was unanimous in Parliament: 123 to 0. It’s not completely clear to me what “personhood” means, except that the Māori get to be guardians of the mountain. Here’s a bit from CNN:
The mountain’s legal rights are intended to uphold its health and wellbeing. They will be employed to stop forced sales, restore its traditional uses and allow conservation work to protect the native wildlife that flourishes there. Public access will remain.
And from Breaking Views:
The legislation, passed by Labour in 2023, recognises Mount Taranaki, alongside its companion peaks, as a living ancestor with its own identity and rights.
. . . . The park surrounding Mount Taranaki will be renamed Te Papa-Kura o Taranaki, with management plans requiring dual approval from the conservation minister and iwi leaders.
Under the Taranaki Maunga Collective Redress Bill, an oversight committee (Te Tōpuni Kōkōrangi) of four iwi and four Crown representatives will govern and set cultural and spiritual values.
A conservation board, including three iwi representatives, will work with the Department of Conservation on daily management. All governance costs will be funded by the Crown. [The New Zealand government.]
There are a couple of issues here. As I said, I have no objection to giving the mountain special conservation status and letting the Māori have most of the governance, though this could create a slippery-slope situation in which every geographic feature could be considered special to the Māori before colonization.
But what is added by giving the mountain “personhood”? As far as I can see, nothing substantive save the recognition that the mountain is an “ancestor”. Yet that formalizes a supernatural belief, which should not be the case. Everything else, like damaging the mountain, building forbidden structures on it and the like, can come under the rubric of conservation.
But, as you can see by the unanimous vote, Kiwis of European-ancestry are in no mood to buck the tide of the sacralization of indigenous claims. Would we name the Grand Canyon as a “person” (“Mr. Canyon”?) if a Native America group regarded it as sacred? Mt. McKinley was renamed, Mt. Denali as that was the traditional name of the local indigenous people. I have no issue with that (Trump, of course, wants to remove the indigenous name), but if the mountain was seen to have spiritual or sacred properties (I doubt that it did, but can find no information), should we deem the mountain a person?
As far as I can see, considering geographic features “people” because they had supernatural and spiritual aspects is a violation of the First Amendment. Now New Zealand has no such provision (it doesn’t even have a constitution), so the government can do what it wants. And what it wants is to give the Māori exactly what they demand.
And all of this is happening at a fraught time in New Zealand’s politics. What is happening is that there is a government bill to codify the provisions of the Treaty of Waitangi so they can become clear law, instead of the nebulous provisions (there are different translations and different interpretations) that people cite to justify what they want. (A common theme you’ll see here is the Māori reliance on the treaty to demand equal rights to teach their “ways of knowing” in schools, a demand that cannot possibly be derived from the three provisions of the Treaty.) In other words, the bill would create a sort of New Zealand constitution based on the Treaty.
But the bill is not going to pass. As CNN says:
The unity provided brief respite in a tense period for race relations in New Zealand. In November, tens of thousands of people marched to Parliament to protest a law that would reshape the Treaty of Waitangi by setting rigid legal definitions for each clause. Detractors say the law — which is not expected to pass — would strip Māori of legal rights and dramatically reverse progress from the past five decades.
The “progress” to which they refer is largely the increasing hegemony of Māori rights and privileges over the past five decades, to the point that, though they constitute only 18% of the inhabitants, they claim at least half of the rights: a huge form of affirmative action. Now it’s clear that Māori were mistreated and subject to bigotry in the past, but what we see happening in New Zealand now is not just an attempt to create equal opportunities for all, or even equity for all groups (to me the former is okay while the latter is not). The goal is larger than equity: to try to create a Super Equity in which indigenous people get at least half of everything, including half the time in science class.
That would be a debacle, but it’s happening, and it will happen far beyond the schools. The result will be the erosion of merit in favor of identity—exactly what has happened in the U.S.
New Zealand really does need a bill like this, but it needs a Constitution even more. Neither will come to pass.
Oh, and I would be remiss if I didn’t add that in the U.S., corporations have been granted certain privileges and responsibilities of “personhood”, including the right to be sued and to be subject to civil or criminal charges. I have no dog in that fight, but there’s nothing spiritual or sacred about it.
h/t: Christopher
A Super-Earth to Test the Limits of Habitability
Every exoplanet discovery is an opportunity to refine models of planet formation, solar system architecture, habitable zones, and habitability itself. Each new planet injects more data into the scientific endeavour to understand what’s going on and how things got this way. However, some planets have such unusual characteristics that they invite a deeper focus and intense follow-up observations.
That’s the case for one new exoplanet. It’s a super-Earth on an unusual orbit that’s giving astronomers an opportunity to test the ideas of habitability and optimistic and pessimistic habitable zones.
The planet is named HD 20794 d, and it orbits a Sun-like star about 20 light-years away. Its eccentric orbit takes it from 0.7 to 1.5 AU from its host star. It spends half of its time beyond the putative habitable zone before travelling back into the zone and slightly inside of it.
Could life somehow survive on a planet like this?
In stellar terms, the exoplanet is right next door, and since the star is bright, the planet is in a great location for observation and study. The discovery of the planet was first reported in 2023, and in new research, a team of astronomers confirms its existence and points out how it’s in a prime location for further study.
The new research is “Revisiting the multi-planetary system of the nearby star HD 20794,” and it’s published in the journal Astronomy and Astrophysics. The lead author is N. Nari from the Instituto de Astrofísica de Canarias in Spain.
Though HD 20784 d was discovered a couple of years ago, it remained a candidate until this new research confirmed it. The planet was known as the 640 d planet because it appeared to have an approximately 640-day orbit around its star. This new study adds more observational details to the planet, including how it’s a great candidate for follow-up atmospheric study. Because it moves in and out of its star’s habitable zone, it’s an opportunity to learn more about habitability and to test and refine scientific models.
“HD 20794, around which HD 20794 d orbits, is not an ordinary star,” explains Xavier Dumusque, Senior Lecturer and researcher in the Department of Astronomy at the University of Geneva and co-author of the study. “Its luminosity and proximity make it an ideal candidate for future telescopes whose mission will be to observe the atmospheres of exoplanets directly.”
Since it’s so close and bright, it’s already been the target of observations. Exoplanetologists have 20 years of data from facilities like HARPS and ESPRESSO to work with. HARPS is the High Accuracy Radial Velocity Planet Searcher, and ESPRESSO is the Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations.
“HD 20794 has been part of long radial velocity (RV) surveys dedicated to the search for low-amplitude long-period signals around solar-type stars, with hundreds of nights of observations with HARPS and ESPRESSO spanning more than 20 years available,” the paper states.
Detecting the super-Earth was difficult. Twenty years of data helped, but it took the development of a new algorithm to find the planet in the data. It’s called YARARA, and it’s a data reduction algorithm recently developed at the University of Geneva (UNIGE). Planets are often obscured by noise in the data, and YARARA can sift through the data and filter out the noise.
“We analyzed the data for years, carefully eliminating sources of contamination,” explained Michael Cretignier, a post-doctoral researcher at Oxford University, co-author of the study and developer of YARARA. Cretignier is also the lead author of the 2023 paper that reported the initial detection of HD 20794 d.
The discovery of HD 20794 d has made astronomers want to monitor the star more closely. “The low stellar activity level and the brightness of HD 20794 has made this target one of the most well-suited candidates for this purpose,” the authors explain.
The system hosts three planets, and this research concludes that all three of them are super-Earths, though there’s some possibility that HD 20794 d could be a mini-Neptune with a non-negligible H/He atmosphere. It follows an elliptical orbit with an eccentricity of 0.45 and has about 5.8 Earth masses.
The planet’s most interesting feature is its orbit. “The orbital period of HD 20794 d resides both in the optimistic and conservative HZ,” the authors write in their research. “This is an interesting result because we do not have many examples of planets with M < 10 Earth masses with mass measurement from RVs in the HZ of Sun-like stars.”
The planet travels between the inner edge of its star’s HZ (0.75 AU) and outside of it (2 AU) as it follows its eccentric orbit. If the planet hosts water, it would shift from its frozen state to its liquid state and back again repeatedly.
This figure from the new research shows how HD 20794 d’s eccentric orbit takes it in and out of both the optimistic and pessimistic habitable zones during its 647-day orbit. Image Credit: Nari et al. 2025.This is an exciting planet. Not only does it follow an unusual orbit, but it’s close to and orbits a bright star. “The closeness of the planetary system, summed with the distance of the star and the planet and the planet-to-star contrast ratio, makes this planet a good candidate for future atmospheric characterization through direct imaging facilities,” the authors write.
One of those facilities is the ANDES instrument on the European Southern Observatory’s Very Large Telescope (VLT). ANDES stands for ArmazoNes high Dispersion Echelle Spectrograph. AndES is a high-resolution instrument that can search for signs of life on Earth-like planets. The detection of biosignatures from exoplanet atmospheres is listed as one of the instrument’s top science cases.
Signs of biosignatures on HD 20794 d won’t jump out at scientists. It’ll take a lot of work among multiple scientific disciplines. Some of that work has begun.
Researchers at the Centre for Life in the Universe (CVU) at the UNIGE’s Faculty of Science are already studying the conditions for the planet’s habitability.
Press Release: A super-Earth laboratory for searching life elsewhere in the Universe
Paper: Revisiting the multi-planetary system of the nearby star HD 20794
The post A Super-Earth to Test the Limits of Habitability appeared first on Universe Today.
This delicate nanoflower is downright deadly to bacteria
Evidence of Recent Geological Activity on the Moon
According to the Giant Impact Hypothesis, the Moon formed from a massive impact between a primordial Earth and a Mars-sized object (Theia) roughly 4.5 billion years ago. This is largely based on the study of sample rocks retrieved by the Apollo missions and seismic studies, which revealed that the Earth and Moon are similar in composition and structure. Further studies of the surface have revealed features that suggest the planet was once volcanically active, including lunar maria (dark, flat areas filled with solidified lava).
In the past, researchers suspected that these maria were formed by contractions in the interior that occurred billions of years ago and that the Moon has remained dormant ever since. However, a new study conducted by researchers from the National Air and Space Museum (NASM) and the University of Maryland (UMD) revealed small ridges on the Moon’s far side that are younger than those on the near side. Their findings constitute another line of evidence that the Moon still experiences geological activity billions of years after it formed.
The research was conducted by Cole Nypaver and Thomas R. Watters, a postdoctoral student and Senior Geologist with the NASM’s Center for Earth and Planetary Studies at the Smithsonian Institute. They were joined by Jackie Clark, an Assistant Research Scientist with UMD’s Department of Geology. The paper detailing their findings, “Recent Tectonic Deformation of the Lunar Farside Mare and South Pole–Aitken Basin,” recently appeared in the Planetary Science Journal.
Based on previous research, scientists have determined that the Moon once had a magnetic field. Like Earth’s, this field was powered by a dynamo in the Moon’s interior caused by a liquid outer core (surrounding a solid inner core) that rotated opposite to its axial rotation. However, crystallization began in the Moon’s core about 4 billion years ago, causing this dynamo to disappear between 2.5 and 1 billion years ago. This led to the disappearance of its magnetosphere and volcanic activity, ceasing about 3 billion years ago. As Clark summarized in a recent UMD press release:
“Many scientists believe that most of the Moon’s geological movements happened two and a half, maybe three billion years ago. But we’re seeing that these tectonic landforms have been recently active in the last billion years and may still be active today. These small mare ridges seem to have formed within the last 200 million years or so, which is relatively recent considering the moon’s timescale.”
Using advanced mapping and modeling, Nypang, Watters, and Clark found 266 previously unknown small ridges on the Moon’s far side. These were largely arranged in groups of 10 to 40 ridges that likely formed in narrow areas 3.2 to 3.6 billion years ago where underlying weaknesses in the lunar crust may have existed. Based on a technique known as “crater counting,” the team found that these ridges were notably younger than other features in their surroundings.
“Essentially, the more craters a surface has, the older it is; the surface has more time to accumulate more craters,” said Clark. “After counting the craters around these small ridges and seeing that some of the ridges cut through existing impact craters, we believe these landforms were tectonically active in the last 160 million years.”
New measurements of lunar rocks have demonstrated that the ancient Moon generated a dynamo magnetic field in its liquid metallic core (innermost red shell). Credit: Hernán Cañellas/Benjamin WeissThe team also noted that the ridges observed on the far side of the Moon were similar in structure to ones found on the near side. This suggests both were created by the same forces, possibly by shallow moonquakes first detected by the Apollo missions. Scientists have since deduced that these are caused by a combination of shifts in the Moon’s orbit and its gradual shrinking – which explains why the Moon still experiences landslides. Understanding the factors that shape the lunar surface is of immense importance to future lunar missions.
As Clark indicated, this presents opportunities for further studies of lunar evolution:
“We hope that future missions to the moon will include tools like ground penetrating radar so researchers can better understand the structures beneath the lunar surface. Knowing that the moon is still geologically dynamic has very real implications for where we’re planning to put our astronauts, equipment and infrastructure on the moon.”
Further Reading: University of Maryland, The Planetary Science Journal
The post Evidence of Recent Geological Activity on the Moon appeared first on Universe Today.
FIRE rebukes U Conn’s medical school for compelled speech by confecting and forcing on students a social-justice Hippocratic oath.
Speaking of FIRE and free speech, I got an email from that organization this morning about how The University of Connecticut has altered the traditional Hippocratic Oath to reflect Social Justice considerations. (It’s far from the only med school that has done this.) This can be considered compelled speech, which students are supposed to recite even if they disagree with it. You can see the traditional forms of the oath here, and hear the newer one here, starting at 44:12. The students are asked to repeat the oath after the speaker.
The new oath is also transcribed below at the Do No Harm site; I’ve put in a red box the parts that disturbed FIRE:
Here’s the email I got from FIRE:
Incoming medical students typically recite the Hippocratic Oath, a pledge to do no harm to patients. But last August, the University of Connecticut required freshmen medical students to recite an ideologically-charged version of the Hippocratic Oath that reads, in part,
“I will strive to promote health equity. I will actively support policies that promote social justice and specifically work to dismantle policies that perpetuate inequities, exclusion, discrimination and racism.”The school violated students’ First Amendment rights against compelled speech by forcing them to affirm contested political viewpoints. The oath effectively emboldens administrators to punish students who, in their opinion, failed to uphold these nebulous commitments. What, exactly, must a medical student do to “support policies that promote social justice”? If a student disagrees with UConn’s definition of “social justice” or chooses not to promote it in the prescribed way, could she be dismissed for violating her oath?
Today, free speech group FIRE called on UConn to make clear that students may refrain from reciting all or part of the oath without any threat of penalty and will not have to affirm any political viewpoints as a condition of their education at the school.
FIRE Program Officer Ross Marchand: “The constant threat of discipline hangs over UConn students. At any time, administrators could decide that a student has broken the vague, partisan oath that she was forced to take. Even an insufficient commitment to ‘social justice’ could land a student in trouble. UConn prioritized politics and ideology above education and the First Amendment, creating a culture of compulsion and fear.”
Thanks! Check out our letter to the school and our blog post.
The blog post notes this:
In August, UConn required the incoming class of 2028 to pledge allegiance not simply to patient care, but to support diversity, equity, and inclusion. The revised oath, which was finalized in 2022, includes a promise to “actively support policies that promote social justice and specifically work to dismantle policies that perpetuate inequities, exclusion, discrimination and racism.”
This practice is a grave affront to students’ free speech rights. In January, FIRE called the medical school to confirm that the oath is mandatory; an admissions staff member told us it was. We are asking them to confirm this in writing.
As a public university, UConn is strictly bound by the First Amendment and cannot compel students to voice beliefs they do not hold. Public institutions have every right to use educational measures to try to address biases they believe stymie the healthcare system. But forcing students to pledge themselves to DEI policies — or any other ideological construct — with which they may disagree is First Amendment malpractice. This is no different than forcing students to pledge their allegiance to a political figure or the American flag.
. . . and adds that these “Social Justice Oaths” are not uncommon:
UConn isn’t alone in making such changes to the Hippocratic Oath. Other prestigious medical schools, including those at Harvard, Columbia, Washington University, Pitt Med, and the Icahn School of Medicine, have adopted similar oaths in recent years. However, not all schools compel students to recite such oaths. When we raised concerns in 2022 about the University of Minnesota Medical School’s oath, which includes affirming that the school is on indigenous land and a vow to fight “white supremacy,” the university confirmed that students were not obligated to recite it. That’s the very least UConn could do to make clear that it puts medical education — and the law — ahead of politics.
The letter suggests that taking this oath is not optional but mandatory. From FIRE’s letter from Marchand to Dean Bruce Liang of the UConn Medical School:
FIRE called the UConn School of Medicine Admissions Office to clarify whether the oath, including these additions, is mandatory for students participating in the ceremony. A staff member confirmed that this oath is required for all incoming students. We have also emailed the admissions office to confirm the mandatory nature of the oath but have yet to receive a
written response.
. . . While UConn may encourage students to adopt the views contained in the oath, the First Amendment bars the university from requiring them to do so. The First Amendment protects not only the right to speak but the right to refrain from speaking. As the Supreme Court has notably held, public institutions may not compel individuals to “declare a belief [and] … to utter what is not in [their] mind.”8 Requiring new students to pledge their loyalty to a particular ideology violates students’ expressive rights, is inconsistent with the role of the university as a bastion of free inquiry, and cannot lawfully be enforced at a public institution. UConn can require students to adhere to established medical standards, but this authority cannot be abused to demand allegiance to a prescribed set of political views—even ones that many students may hold. Specifically, the school may not compel students to pledge to support or promote concepts such as “social justice” and “equity,” notions that have long been the subject of intense political polarization and debate
You’d think that these deans would know something about the prohibition about compelled speech, but of course they cannot conceive that anybody would opopose the social justice-y bits of their new Oath. They clearly need a lesson in the First Amendment!
Finally FIRE asks for a response in two weeks:
FIRE calls on UConn to make clear that students may refrain from reciting all or part of the oath without any threat of penalty and will not have to affirm any political viewpoints as a condition of their education at the school.
We request receipt of a response to this letter no later than the close of business on February 14, 2025
You can go to this page to send a quick fill-in-the-form letter. I did.
An Asteroid Has a 1% Chance of Impacting Earth in 2032
The odds of a sizable asteroid striking Earth are small, but they’re never zero. Large asteroids have struck Earth in the past, causing regional devastation. A really large asteroid strike likely contributed to the extinction of the dinosaurs. So we shouldn’t be too surprised that astronomers have discovered an asteroid with a better than 1% chance of striking our world. Those odds are large enough we should keep an eye on them, but not large enough that we should start packing bags and fleeing to the hills.
The rock, named 2024 YR4, is somewhere between 40 – 100 meters wide, which would make it a “city killer” asteroid. If it does strike Earth, it wouldn’t decimate human civilization and cause mass extinctions, but it could destroy a heavily populated area if it struck a city, or trigger a tsunami if it struck the ocean. It would back a punch similar to the 1908 Tunguska event in Northern Siberia.
So what is the overall risk of 2024 YR4? The scale most commonly used for asteroid impact risks is known as the Torino Scale. It combines the overall size and relative speed of an object with its odds of impact to assign a number ranging from 0 to 10, where 0 means there is no risk of impact and 10 means it’s time to call Bruce Willis to save us all from extinction. That said, the highest number any asteroid has had on the scale is 4. This was for the asteroid Apophis soon after its discovery, which has now been downgraded to 0.
Currently, 2024 YR4 has a 3 on the scale, which means it “merits attention by astronomers.” It is currently the only object with a number other than 0 on the Torino Scale, and it means a couple of things come into play. The first is that the International Asteroid Warning Network (IAWN) will work to pin down the orbit of the asteroid. Chaired by NASA, the IAWN coordinates with observatories around the world to make detailed observations of 2024 YR4. It will take time to gather enough data. But what will likely happen is that they will determine there is no risk of collision, and 2024 YR4 will be demoted to 0 on the scale.
The second thing initiated is the Space Mission Planning Advisory Group (SMPAG), chaired by the European Space Agency. They have a scheduled meeting next week when there will be some initial discussions about a possible mission to 2024 YR4 to shift its orbit. If we do find there is a real risk of impact, this group would ramp up quickly. But again, this isn’t likely.
Statistically, asteroids the size of 2024 YR4 strike Earth every couple thousand years or so. This is why astronomers track these objects and are constantly looking for more. So even though the odds of an impact are never zero, with planning and preparation we should be able to ensure that any real risk can be mitigated.
The post An Asteroid Has a 1% Chance of Impacting Earth in 2032 appeared first on Universe Today.
Lightsails could reach distant star systems
Lightsails could reach distant star systems
Fans not enough for elderly in heat waves
Aging reactors need a concrete solution
A new feature discovered in radioactive lanthanum isotopes
A new feature discovered in radioactive lanthanum isotopes
This multiferroic can take the heat -- up to 160?
Day 3: USC Conference on Censorship in the Sciences
To finish up my reportage on the USC conference on Censorship in STEM, I present a video Day 3 for your delectation. It’s 6½ hours long, but below I’ll give the time marks for three items of interest, one of which is of interest only because it includes ME.
First the whole day; I’ve put the written schedule at the bottom so you can find the other talks.
The first talk is by heterodox black political scientist Wilfred Reilly, speaking about ten taboo topics; it begins at the beginning. I won’t list the taboos, so you’ll have to listen to the talk to see them.
The second talk, involving Julia Schaletzky, Luana Maroja, and me, begins at 4:29:51; its topic is “Censorship, sciences, and the life sciences”. I can’t bear to listen to myself again. But I advanced the video 5:26:00, where some guy asks me about filling the “god-shaped hole” in humanity, and by eliminating religion the hole is filled by solipsism, some undefined “meta-narrative”. I got as heated as I ever do in a meeting, which is not very heated, but did stand my ground.
But below a talk you must hear. It’s from Greg Lukianoff, President of the Foundation for Individual Rights and Expression (FIRE). I think it was the best talk of the conference, and was also the last one. Fortunately, you can avoid scrolling around above because the talk is also posted as a standalone video (below). It’s a bit over 52 minutes long, and the topic is “How cancel culture destroys trust in expertise.” Lukianoff is a passionate and eloquent speaker.
It’s a very good talk packed with information and slides, beginning with what happened to professors during the Red Scare in America the 40s and 50s, and then going on to the increase in cancellation happening today: how many professors get fired, how many deplatforming attempts are happening and how fast they’re increasing, and how schools rate on free speech. (Lukianoff really doesn’t like Harvard or Columbia; see 28:00, at 44:30, and at 51:44, when he says that Columbia should declare itself a “technical school.”)
Lukianoff also gives a number of examples of demonization or cancellation, all of which bear on how speech is chilled (note his comment on the Nature Human Behavior policy), and describes some ongoing FIRE lawsuits to promote free speech.
There are a full twenty minutes of good questions, the first by Jonathan Rauch (“What about the ACLU, the AAUP, and other organizations like yours?”). All of the questions get thorough and thoughtful answers.
Finally, here’s the schedule for day 3:
The best new science fiction books of February 2025
Amazon river dolphins may send messages with aerial streams of urine
Defenders of Dr. Vinay Prasad’s Vulgar, Vengeful Vitriol Have No Right to Sanctimoniously Scold Anyone About Decorum
Defenders of Dr. Vinay Prasad fake a concern about tone to intimidate critics and create a safe space for his misinformation.
The post Defenders of Dr. Vinay Prasad’s Vulgar, Vengeful Vitriol Have No Right to Sanctimoniously Scold Anyone About Decorum first appeared on Science-Based Medicine.'Obsolete' muscle that wiggles ears actually activates while listening
How Hydrogen Kept Early Mars Warm
Mars haunts us as a vision of a planet gone wrong. It was once warm and wet, with rivers flowing across its surface and (potentially) simple life residing in its water bodies. Now it’s dry and freezing.
Could Earth suffer this fate? Are there innumerable other worlds throughout the Universe that were habitable for a period of time before becoming uninhabitable?
To answer those questions, we have to answer one of the big questions in space science: What drove the changes on Mars? New research shows that hydrogen played a critical role in keeping ancient Mars warm for periods of time, as the planet’s temperature oscillated between warm and cold.
The research is “Episodic warm climates on early Mars primed by crustal hydration.” It’s published in Nature Geoscience, and the lead author is Danica Adams, a postdoctoral fellow in the Department of Earth and Planetary Sciences at Harvard University.
“Early Mars is a lost world, but it can be reconstructed in great detail if we ask the right questions.”
Robin Wordsworth, Harvard University.There’s ample evidence of flowing surface water on ancient Mars. NASA’s Perseverance rover is exploring Jezero Crater, an ancient paleolake with deep sediment deposits carried there by flowing water. Satellite views show numerous ancient river channels. There’s also clear evidence of ancient lakes.
For a long time, the dominant scientific thought was that Mars was once warm and then became cold. In recent years, more thorough evidence suggests that Mars oscillated between being a warm and a cold planet.
If that’s true, what drove those oscillations?
The first difficulty in explaining early warm periods on Mars is the faint young Sun paradox. Astrophysicists calculate that the young Sun emitted only 70% of the energy it does now. How could Mars have had liquid surface water with so little solar output?
“It’s been such a puzzle that there was liquid water on Mars, because Mars is further from the sun, and also, the sun was fainter early on,” said lead author Danica Adams in a press release.
Evidence suggests that Mars once had enough water for an equivalent global ocean from 100 m to 1,500 m deep during the planet’s late Noachian period. Scientists have found hundreds of lakebeds from the Noachian, some as large as the Caspian Sea. However, the planet is suspected to have been too cold to host this much liquid water without a more efficient heat-trapping atmosphere. CO2 alone couldn’t do it, but researchers think that a more hydrogen-rich atmosphere could.
Lake Eridania, also known as the Eridania Sea, is a massive ancient lakebed on ancient Mars. It covered approximately 1.1 million sq. km. and was as deep as 1000 meters in some parts. Image Credit: By Jim Secosky chose this image NASA – https://photojournal.jpl.nasa.gov/figures/PIA22059_fig1.jpg, Public Domain, https://commons.wikimedia.org/w/index.php?curid=63303137The problem is that hydrogen doesn’t tend to persist in atmospheres.
“Greenhouse gases such as H2 in a CO2-rich atmosphere could have contributed to warming through collision-induced absorption, but whether sufficient H2 was available to sustain warming remains unclear,” the authors write in their paper. Collision-induced absorption (CIA) is when molecules in a gas collide, and interactions from the collision allow molecules to absorb light. CIA could amplify the atmospheric CO2’s warming effect.
If there was a hydrogen source that allowed the atmosphere to replenish itself, that could explain how Mars oscillated between cold and dry and warm and wet. The researchers used a combined photochemical and climate model to understand how the atmosphere responded to climate variations and reactions between H2O and rock.
“Early Mars is a lost world, but it can be reconstructed in great detail if we ask the right questions,” said study co-author Robin Wordsworth from Harvard. “This study synthesizes atmospheric chemistry and climate for the first time to make some striking new predictions – which are testable once we bring Mars rocks back to Earth.”
The team’s research showed that early Mars had two distinct climate states that persisted for long timescales. The warm climate sustained surface liquid water and lasted between 100,000 and 10 million years. These periods were created and sustained by H2 from crustal hydration with some help from volcanic activity. During crustal hydration, water is lost to the ground, and H2 is released into the atmosphere. The cool climate lasted about 10 million years and featured a CO-dominated atmosphere caused by oxidant sinks in the planet’s surface.
This figure from the paper shows Mars’ H, C, and O chemistry, including ground sinks and escape processes. On the left are the cool and dry epochs triggered by oxygen lost to the crust. On the right are the warm and wet epochs driven by crustal hydration and oxidation that release H2. “In all epochs, CO2 and H2O photolysis (energy from photons represented in the cartoon as hv) drives the photochemistry, and escape of H, C and O is considered,” the authors write. In modern Mars, however, dissociative recombination is how oxygen primarily escapes. Image Credit: Adams et al. 2025.“We find that H2 <molecular hydrogen> outgassing from crustal hydration and oxidation, supplemented by transient volcanic activity, could have generated sufficient H2 fixes to transiently foster warm, humid climates,” the authors explain.
The team’s models showed that Mars’ climate oscillated like this for about 40 million years during the Noachian and Hesperian periods. Each warm period lasted at least 100,000 years. According to the researchers, these timescales are in agreement with the length of time it took to carve Mars’ river valleys.
The planet’s atmospheric chemistry fluctuated during these periods. As sunlight struck CO2, it was converted to CO. During warm periods, the CO cycled back into CO2, and CO2 and H2 were dominant.
During cold periods, the CO recycling slowed down, CO built up in the atmosphere, and it triggered a more oxygen-reduced state. In this way, the redox state of the atmosphere oscillated dramatically over time.
“We’ve identified time scales for all of these alternations,” Adams said. “And we’ve described all the pieces in the same photochemical model.”
Mars’s modern-day surface supports the researchers’ alternating atmospheric redox hypothesis. The surface shows a “paucity of carbonates,” the researchers explain in their paper. These should form in an atmosphere dominated by CO2 where neutral pH water is present, as long as there is abundant open-system crustal alteration at the planet’s surface. Adams and her co-researchers say their hypothesis can explain the lack of carbonates.
Carbonates were first detected on Mars in 2008, and scientists expected to find large deposits of them. However, those large deposits were never found. If early Mars had abundant water for a long time, there would be abundant carbonates.
Though carbonates are present on Mars, they’re not abundant. If Mars had been wet for a long time, they should be abundant. Image Credit: ESA.Mars’ surface rocks also contain both oxidized and reduced species of minerals. The authors say that is evidence the surface is far out of equilibrium, which their hypothesis supports. “While both oxidized and reduced species may form under one climate, the deposition rate of different species is sensitive to the climate. For example, warm climates preferentially deposit nitrate while cool climates preferentially deposit nitrite,” the authors write.
In any case, Mars is an extremely interesting puzzle. Without plate tectonics, its surface is largely unchanged from ancient times. Unlike Earth, which recycles its surface and erases evidence, evidence of Mars’ warm, wet periods is easy to see. “It makes a really great case study for how planets can evolve over time,” lead author Adams said.
Much of what scientists hypothesize about Mars can only be confirmed by in-situ measurements. The NASA rovers MSL Curiosity and Perseverance both have onboard labs to study rocks. Perseverance, however, is also caching rock samples for eventual return to Earth. Those samples, if they make it to Earth labs, will be critical in answering our questions about Mars.
“Hence, full interpretation of the redox paradox will require careful comparison of our alternating atmospheric redox hypothesis with chemical and isotopic datasets collected in situ and with igneous and water-altered rocks from the first 1–2 billion years of Mars’s history that comprise the samples presently being collected by the Perseverance rover,” the authors conclude.
This hypothesis raises questions about Mars’s habitability in the past. According to our understanding, oscillations between warm and wet and cold and dry pose a significant barrier to life starting and evolving. But that’s beyond the scope of this paper.
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