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An analysis of the sloth family tree suggests three different groups of the animals evolved to gigantic sizes in response to cold and dry conditions

Multi-messenger astronomy has been all the rage lately. It involves capturing data on the gravitational and electromagnetic signals from catastrophic cosmic events. However, with that newfound interest comes required updates to infrastructure. Gravitational wave detectors have been upgraded and will be even more sensitive soon. But to realize the promise of multi-messenger astronomy, scientists must have a fleet of spacecraft watching the entire sky for high-energy signals indicative of the events that cause gravitational waves. At least, that is the team's long-term plan behind the High Energy Rapid Modular Ensemble of Satellites Pathfinder (HERMES-PF) mission, which successfully launched in March and is currently undergoing commissioning.

Our understanding of our Solar System is still evolving. As our telescopes have improved, they've brought the Solar System's deeper reaches into view. Pluto was disqualified as a planet because of it. Now, new research says another dwarf planet may reside at the edge of the Solar System. Its presence supports the Planet X hypothesis.

A new study says students appear to be using generative artificial intelligence (GenAI) responsibly, and as a way to speed up tasks, not just boost their grades.

Chemists have developed an efficient skeletal editing method for frequently used heteroaromatic structures. The technique could serve as a means to chemically modify biologically active compounds.

Astronomers have observed a massive and extremely active barred spiral galaxy in the early Universe and found that it has important similarities and differences with modern galaxies. This improves our understanding of how barred spiral galaxies, like our own Milky Way Galaxy, grow and evolve.

Researchers have mathematically elucidated how the presence of crystals and gas bubbles in magma affects the propagation of seismic P-waves. A novel equation was derived to describe the travel of these waves through magma, demonstrating how varying proportions of crystals and bubbles influence wave velocity and waveform characteristics.

Researchers have discovered a phenomenon -- applying pressure to a copper-chromium Prussian blue analog, which is a compound featuring crystal voids, causes the discharge of water retained within these voids. This material is expected to serve as a novel onsite water production platform for extraction of water solely through pressure application, without temperature or humidity control, even in arid regions.

The puzzling behavior of Titan's atmosphere has been revealed. The team has shown that the thick, hazy atmosphere of Saturn's largest moon doesn't spin in line with its surface, but instead wobbles like a gyroscope, shifting with the seasons.

Ammonia is a chemical essential to many agricultural and industrial processes, but it's mode of production comes with an incredibly high energy cost. Various attempts have, and are, being made to produce ammonia more efficiently. For the first time, a group has combined atmospheric nitrogen, water and sunlight, and using two catalysts, produced sizable quantities of ammonia without a high energy cost. Their processes mirror natural processes found in plants utilizing symbiotic bacteria.

The risk of heavy rainfall and severe flooding increases with climate change. But property owners -- regardless of size -- often underestimate their own responsibility and are unaware of what preventive measures they can take themselves.

From deadly floods in Europe to intensifying tropical cyclones around the world, the climate crisis has made timely and precise forecasting more essential than ever. Yet traditional forecasting methods rely on highly complex numerical models developed over decades, requiring powerful supercomputers and large teams of experts. According to its developers, Aurora offers a powerful and efficient alternative using artificial intelligence.

Is artificial intelligence (AI) capable of suggesting appropriate behavior in emotionally charged situations? A team put six generative AIs -- including ChatGPT -- to the test using emotional intelligence (EI) assessments typically designed for humans. The outcome: these AIs outperformed average human performance and were even able to generate new tests in record time. These findings open up new possibilities for AI in education, coaching, and conflict management.

A new artificial intelligence system pinpoints the origin of 3D printed parts down to the specific machine that made them. The technology could allow manufacturers to monitor their suppliers and manage their supply chains, detecting early problems and verifying that suppliers are following agreed upon processes.

A new artificial intelligence system pinpoints the origin of 3D printed parts down to the specific machine that made them. The technology could allow manufacturers to monitor their suppliers and manage their supply chains, detecting early problems and verifying that suppliers are following agreed upon processes.

Scientists found that neural networks cannot yet forecast 'gray swan' weather events, which might not appear in existing training data but could still happen -- like 200-year floods or massive hurricanes.

Neuroscientists and materials scientists have created contact lenses that enable infrared vision in both humans and mice by converting infrared light into visible light. Unlike infrared night vision goggles, the contact lenses do not require a power source -- and they enable the wearer to perceive multiple infrared wavelengths. Because they're transparent, users can see both infrared and visible light simultaneously, though infrared vision was enhanced when participants had their eyes closed.

Neuroscientists and materials scientists have created contact lenses that enable infrared vision in both humans and mice by converting infrared light into visible light. Unlike infrared night vision goggles, the contact lenses do not require a power source -- and they enable the wearer to perceive multiple infrared wavelengths. Because they're transparent, users can see both infrared and visible light simultaneously, though infrared vision was enhanced when participants had their eyes closed.

This is the last (I hope) of three posts on a topic I’m reading about: academic freedom (I have to be on a panel about the topic in June). Part 1 is here and part 2 is here. I won’t reprise what I said in those posts except to summarize their main points:

Post 1: The “clash of ideas” touted by Mill and others as the primary virtue of free speech, assuming that this clash will produce the truth, is in fact ineffective at furnishing us with the truth, for truth is ascertained not by a collision of ideas given equal weight, but from empirical investigation (“science construed broadly”). Nevertheless, free speech is a sine qua non for democracy, whose working reflects popular opinion, and popular opinion is the foundational turtle of democracy.

Post 2: Academic freedom, the right of scholars to study, research, and teach what they want without interference, is essential for finding the truth about anything (“truth” is what exists in the universe). This does involve the clash of ideas mentioned above, but not all ideas are regarded as equal under academic freedom: some have more credibility than others, viz., evolution vs. creationism. Further, unlike the egalitarianism of the public square, academic freedom assumes a meritocracy and also involves scholarly behavior that would seem to (but doesn’t) violate the First Amendment, like compelled speech (a professor, for example, must teach her topic and not some other topic).  Finally, scholarly standards differ from discipline to discipline, and so the notion of “what academic freedom entails” will also differ:  “success” in doing literary criticism, for example, is very different from “success” in molecular biology.  I maintain further, that the notion of “truth” isn’t relevant to much of humanities, for example literary criticism, music, art, or ethics. There is no empirical truth to be found there, but nevertheless the clash of ideas is still essential to dispel error. (“You can’t prove that Spinoza said that.”)

The more I read, the more disagreement I find about what academic freedom really means and how it relates to free speech. Is it covered by the First Amendment? (some say “yes”)—or is it something different? Is academic freedom something possessed by professors, universities, students, or all of the above?  I would answer to the first part “no,” since “freedom of thought” isn’t covered by the First Amendment. But I read last night that the Supreme Court has deemed academic freedom not only a First-Amendment right, but one that applies to all universities, be they public or private. (The First Amendment applies only to public universities, since they’re an arm of the government, though many universities voluntarily adhere to its standards).

As I said, every private school, including Hamline University where a professor was fired for showing an image of Mohammed, has academic freedom for its faculty; the fired Hamline professor was defended by many (including the AAUP) for having her academic freedom violated, and she settled with Hamline. (The President of the College subsequently resigned.

I emphasize that when I say that many areas of the humanities  are incapable of finding truth, that is not to denigrate them or deem them inferior to science (see a list of their areas here). For humanities have their own ambit. Philosophy keeps us thinking straight and prevents us from falling into error, literature puts us into the shoes and minds of other people, and music and art give us beauty. Life without humanities would be dull indeed, and I’ve always said that in general scientists know more about and appreciate the humanities more than humanities people know about and appreciate science.

This leaves one question: what about institutional neutrality—the principle that universities should not make ideological or political pronouncements unless they bear directly on the mission of the university? (This was of course first embodied in Chicago’s Kalven Principle.)  The purpose of this principle is to avoid the chilling of speech that would occur if a university establishes an “official” position that students and faculty would be loath to violate. (Everyone, of course, is free to voice their personal opinion according to the First Amendment: you just can’t do it in the name of the University. And our late President Bob Zimmer said that he was reluctant to give his own personal opinion because it could be taken to represent the University of Chicago’s position.).

By impeding the chilling of speech, Kalven also impedes the chilling of research and teaching. If, for example, a college held the position that sex was not binary, and that there was a spectrum of sex in humans, researchers would be reluctant to either publish, work on, or make that claim. (The President of Spectrum U. would be Agustín Fuentes.)

Thus institutional neutrality is the rope that ties together free speech and academic freedom.  Any university worth its salt—one that wants to foster discourse and consider all ideas on their merits, however offensive—should adhere to the three prongs of Kalven, academic freedom, and free speech. It’s a pity that so few Universities follow all three (only 30 American universities have adopted institutional neutrality; and that’s out of 2,637 four-year colleges!).

And so endeth this homily.

Nanoparticle-infused contact lenses can transform infrared radiation into different colours of visible light, potentially enabling a new form of night vision – no batteries required