Science

DNA robots are emerging as tiny programmable machines that could one day deliver drugs, hunt viruses, and build molecular-scale devices. By borrowing ideas from traditional robotics and combining them with DNA folding techniques, scientists are creating structures that can move and act with precision. These robots can be guided using chemical reactions or external signals like light and magnetic fields.

If you thought the current crop of satellite megaconstellations was bad, you’re going to be horribly disappointed by new proposals from both SpaceX and a company called Reflect Orbital. Their combined plans would fundamentally alter the night sky as we know it, and the global astronomical community is sounding the alarm - most notably letters from the Royal Astronomical Society (RAS), the European Southern Observatory (ESO), and the International Astronomical Union (IAU) strongly opposing the plan, which currently sits with America’s Federal Communications Commission (FCC) for approval.

NASA’s Artemis II mission will be the first time humans have been around the moon in half a century, and its next launch window opens on 1 April

The science suggests that olive oil can help us fight cognitive decline and even Alzheimer’s. Columnist Helen Thomson finds that only works if we choose the right kind

The science suggests that olive oil can help us fight cognitive decline and even Alzheimer’s. Columnist Helen Thomson finds that only works if we choose the right kind

A new shape-shifting material can change both its texture and color in seconds, inspired by the camouflage abilities of octopuses. By precisely controlling how a polymer swells with water, researchers can create detailed, reversible patterns at the nanoscale. The material can even mimic realistic surfaces and dynamically adjust how it reflects light. In the future, AI could allow it to automatically blend into its surroundings.

Scientists have taken lasers beyond light and into the realm of sound, creating a breakthrough “phonon laser” that manipulates tiny vibrations at the quantum level. By dramatically reducing noise in these systems, researchers can now measure motion and forces with unprecedented precision. This advance could unlock new ways to study gravity, probe quantum physics, and even revolutionize navigation with ultra-accurate, satellite-free systems.

Perovskite crystals can dramatically and reversibly change shape when hit with light, a behavior not seen in conventional semiconductors. This effect, called photostriction, can be finely tuned depending on the light’s intensity and color. Researchers say these materials act more like adjustable systems than simple switches. The finding could lead to a new generation of light-powered sensors and devices.

Perovskite crystals can dramatically and reversibly change shape when hit with light, a behavior not seen in conventional semiconductors. This effect, called photostriction, can be finely tuned depending on the light’s intensity and color. Researchers say these materials act more like adjustable systems than simple switches. The finding could lead to a new generation of light-powered sensors and devices.

It's not often that astronomers can observe huge changes in a galaxy's brightness over the course of a few years. Most galaxies change in brightness (and other characteristics) over millions or billions of years. So, when images of the 10-billion-light-year distant galaxy J0218-0036 showed that it dimmed down by a twentieth of its previous brightness in just 20 years, observers were surprised. What could cause it to do that? That's not "normal" for AGN.

The ice giant Uranus is one of the most fascinating objects in the solar system, with its sideways rotation, intricate ring system, and unique family of moons. However, it is also one of the least explored objects in the solar system, owing to its extreme distance from the Sun. With NASA’s Voyager 2 spacecraft remaining as the only spacecraft to visit Uranus, scientists continue to design and envision mission concepts for returning to explore Uranus and its icy secrets.

Less than two days from now, NASA’s Artemis II mission is scheduled to lift off for its historic 10-day journey around the Moon, marking the first time humans have ventured beyond Low Earth Orbit for the first time since Apollo 17 in 1972, and possibly even set new distance records for traveling beyond Earth. However, Artemis II is only scheduled as a flyby mission and will not be landing humans on the lunar surface, with this endeavor being scheduled for later missions.

Scientists at the University of Waterloo have uncovered a bold new way to explain how the universe began—one that could reshape our understanding of the Big Bang. Instead of relying on patched-together theories, their approach shows that the universe’s explosive early growth may arise naturally from a deeper framework called quantum gravity.

Scientists at the University of Waterloo have uncovered a bold new way to explain how the universe began—one that could reshape our understanding of the Big Bang. Instead of relying on patched-together theories, their approach shows that the universe’s explosive early growth may arise naturally from a deeper framework called quantum gravity.

Astronomers studying the ultra-faint dwarf galaxy Pictor II have found an extremely chemically peculiar star that contains traces of elements created by the first stars in the Universe. It's called PicII-503, a "second-generation star" that is one of the most chemically primitive stars ever found.

This collection of images from NASA’s Chandra X-ray Observatory and other telescopes contains regions where stars are forming. Often nicknamed “stellar nurseries,” they are cosmic gardens from which stars – not plants – emerge from the interstellar soil of gas and dust.

Even if the conflict in the Middle East ends today, higher fuel, fertiliser and pesticide prices will lead to a food shock in the coming months. There is no easy way out, but accelerating the net-zero transition will help prevent future shocks

Alan Lightman a physicist best known for his writing about science, most famously his 1992 novel Einstein’s Dreams. At present he’s a “professor of the practice of the humanities at MIT.”

Lightman’s recent article in The Atlantic (click headline below or find article archived for frere here), while seeming to buy into the magazine’s recent penchant for osculating religion, really is not.  It seems to mostly express a kind of spiritual wonder.  But it’s confusing for two reasons.

First, he denies materialism, but latter accepts it (see below).

Second he deals with two forms of dualism: the mind/body dualism dealt with by Descartes, but also a dualism caused by recent advances in medical technology, in which part of your body is not made of tissue (examples are artificial hearts and mind/electrode interfaces) making people part human, part machine.

After reading the piece, I wasn’t sure what the point was except to mirror Lightman’s wonder at the world and his unanswered questions.

It began when Lightman had a colonoscopy, which got  him wondering what was going on inside himself; as he said, “I felt like a trespasser in my own body.” And that gets him into the first form of dualism.  All bolding henceforth is mine:

Modern neuroscience has largely overthrown the classical view that the mind and the body are fundamentally different substances, and it has shown that all of our thoughts and mental experiences are rooted in the material brain. But even granting that scientific view, there remains a profound disconnect between our conscious self-awareness—rooted in the three pounds of gooey stuff in our skulls—and the rest of our body.

And here’s the confusing bit, where he denies materialism: he simply has to be more than just the substance of his body. Bolding is mine:

After that unsettling medical adventure, I began mulling over why I was so disturbed to see the insides of my body. A number of issues come to mind. For starters, the experience struck me as a vivid demonstration of my materiality. Even though I am a scientist and have a materialist view of the world, I still harbor the belief that I am more than just a jumble of tissues and nerves. The experience of consciousness and life is so sublime that it is hard to imagine it all arising from mere atoms and molecules. 

This seems like a case of cognitive dissonance, but it’s not clear whether he really believes what’s in bold as opposed to “harboring” that belief. Yes, we don’t know how consciousness works, but what else is there to create it except the stuff of our bodies and brains? For other people, like Ross Douthat, a failure to understand is by default evidence for god, but nobody who knows the history of science would think that.

Lightman then muses for a while about our failure to fully understand our own bodies, but what is a source of puzzlement to him is a challenge to scientists. We have never made progress in understanding nature by assuming that naturalism is wrong, and so the program to understand consciousness must begin with a naturalistic program—until we find an exception to naturalism!

But later on, Lightman says that he’s really a materialist:

I must again confess that I am a materialist. I respect the belief in an immortal soul. I respect the belief in a nonphysical mind. But, despite my predilection for some transcendent element, I do not share those beliefs. Still, I am baffled by the disconnect I feel between body and mind. I look down at my bare feet and command my toes to wiggle. And they wiggle. But “I” am looking down at them from above. My toes are things that I gaze at from some distance. But what distance? The distance from the camera of my eyes? The distance from my conscious mind, which has these thoughts? And my toes are visible. The inside of my body is even more distant.

Once again his source of wonder is his victimization by an illusion, one described so clearly by Dan Dennett, that there is an “Alan Lightman” sitting somewhere in his brain, a little homunculus that looks down on his toes. Again, he’s baffled, while a biologist would see a challenge. My own view, and I’m no expert, is that the “hard problem of consciousness” will simply devolve to a problem of what brain connections are necessary for the sensation consciousness, and then we’ll have to say, “And that is all we know.”

Finally, having confessed his bafflement, Lightman goes on to describe some medical advances that truly are amazing, but, like the one below, must surely have a naturalistic explanation:

In 2013, scientists at the California Institute of Technology and the University of Southern California implanted two computer chips in the brain of Erik Sorto, then 32, who was paralyzed from the neck down from a gunshot wound. The output from the chips is connected to a computer, which interprets the patterns of their electrical activity; the computer, in turn, is connected to a robot arm. When Sorto is thirsty and merely thinks about reaching for a cup of water, the computer chips in his brain sense his desire and relay that thought to the computer, and the robot arm grabs a cup of water and brings it to his lips. When I interviewed Sorto in November 2021 and asked him what it felt like to have this machine in his body, he said that he felt mostly human but also part cyborg.

Now that is amazing, especially because, as far as I know, the way it works was not designed from first principles, although some knowledge of neuroscience was surely required (where do you put the chips?). But this surely has a naturalistic explanation, unless you think that god did it or some fundamental principles of how neurons and muscles work has eluded us.

And that’s pretty much it.  I may have failed to be impressed simply because I’m jaded, and as a scientist I’m used to unsolved problems that to other conjure up spiritual or even non-naturalistic explanations. But still, I wonder why The Atlantic published this.

Cognitive decline, mental health and heart disease are all shaped by the deep links between heart and brain – with major implications for diagnoses and treatment

Scientists have discovered something that seems almost impossible: under the right conditions, ordinary liquids can snap apart like solid objects. In experiments, researchers found that when certain liquids are stretched with enough force, they don’t just thin and flow—they suddenly fracture with a sharp break, much like metal under stress. This surprising behavior appears to be tied to viscosity, not elasticity, challenging long-held assumptions about how liquids behave.