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Introducing Claude Fable 5.2 and Claude Mythos 5.2

The consensus in physical robotics just took a massive shift—but the real story is far more nuanced than the hype suggests. ⚙️💡

Six months ago, the prevailing orthodoxy was clear: text/code LLMs lacked spatial grounding, and end-to-end Vision-Language-Action (VLA) or world models were the *only* path to physical control. Then came Claude Fable 5.2, setting new state-of-the-art scores on RoboDojo—a simulated two-arm manipulation benchmark—and demonstrating impressive zero-shot spatial planning on un-trained tasks.

Naturally, many rushed to claim LLMs had solved physical manipulation. But if you look closer at real-world physical tests—beyond clean simulation environments—the picture changes fast.

In a recent informal physical tabletop test, an LLM-guided robotic arm was set up to play checkers. The result? 64 misses and multiple dropped tokens.

Why the stark disconnect between benchmark performance and physical reality? It comes down to the fundamental divide between high-level spatial reasoning and real-world motor execution:

🧠 What LLMs Get Right (The High-Level Brain)

* Strategic Spatial Logic: Fable 5.2 excels at abstract spatial priors (gravity, leverage, multi-step ordering) and long-horizon in-context error recovery. It easily decides *what* moves to make.

Continue reading “Introducing Claude Fable 5.2 and Claude Mythos 5.2” | >

30 Minutes on a Vibrating Mattress Shifted Alzheimer’s-Linked Proteins in a Small Trial

Put this down as one of the more unusual approaches to Alzheimer’s treatment that we’ve come across to date: having patients lie on a vibrating mattress to clear out waste proteins that could be building up in the brain.

These vibrations are designed to mimic the brain’s natural garbage disposal system, which runs mainly at night.

Blood pressure in the brain drops, and slow pulses then clear out anything that shouldn’t be there, ready for the morning.

The Gurzhi Effect Reaches Three Dimensions

Measurements on micrometer-scale cadmium samples provide definitive evidence of an unusual charge-transport regime in a 3D metal.

In an ordinary metal, electrons undergo collisions with impurities, phonons (lattice vibrations), and material boundaries. By removing momentum from the electrons, these collisions determine the metal’s conductivity. One of these types of collisions—between electrons and phonons—becomes more frequent at high temperatures, further impeding the electron flow and decreasing the metal’s conductivity as it warms. But more than 60 years ago, the physicist Radii Gurzhi predicted that, under certain circumstances, some metals might behave more like classical liquids, in which thermal energy reduces the fluid’s internal resistance to flow, or viscosity, causing conductivity to increase with temperature [1]. Despite having been studied theoretically for decades, the so-called Gurzhi effect was only recently confirmed in graphene [2], following tentative observations in potassium [3].

The art of good conversation may involve a little pink noise

Most of us like a good old chat with friends, colleagues, neighbors or acquaintances. But what can turn a really good chat into a great one? Sure, conversation topics matter, but scientists have found underlying patterns that may explain our best interactions.

The question has long vexed scientists. Previous studies have mostly focused on how closely people’s words and ideas match, rather than how chats flow and shift from one moment to the next.

But researchers Kathryn O’Nell, Emily Finn and Kiara L. Sanchez at Dartmouth College in the United States took a different approach.

Gatineau Park foliage reveals local Cold War nuclear testing legacy

For more than six decades, local scientists have collected sugar maple leaves from Gatineau Park to measure their radiocarbon levels, creating the longest continuous record of its kind. Now, a study of those leaves led by the André E. Lalonde National Facility for Accelerator Mass Spectrometry (AEL-AMS) located at the University of Ottawa shows that the effects of Cold War–era nuclear weapons testing have only recently disappeared from the local biosphere. The study, titled “Stored carbohydrates buffer Bomb and Suess radiocarbon effects in maple leaves across a 65-year Ottawa region record,” was published in Scientific Reports.

The Geological Survey of Canada began collecting maple leaves in Gatineau Park in 1961, taking samples once a month during each growing season. Its scientists analyzed the leaves until the agency’s radiocarbon laboratory closed in 2004. The AEL-AMS later took over the analyses and extended the record through 2025, adding 59 annual and seasonal measurements. The collection is ongoing, though leaves gathered in September 2026 are not included in the current study.

“These leaves are a 65-year diary of the atmosphere,” explains Dr. Leonard Wassenaar, executive director of the André E. Lalonde National Facility for Accelerator Mass Spectrometry (AMS) at the University of Ottawa. “It took more than 65 years for the extra radiocarbon from weapons testing to disappear from the Ottawa-area biosphere. The effects were still with us decades after the last test.”

New perovskite system extends room-temperature spin polarization via successive quantum wells

A research team led by Lu Haipeng, a professor in the Department of Chemistry at The Hong Kong University of Science and Technology (HKUST), has achieved a breakthrough in preserving spin information for optoelectronic technologies. The team has developed a perovskite chiral multiple quantum-well system that maintains spin polarization approximately 300 times longer at room temperature. The study opens new possibilities for future quantum technologies and next-generation spin-based applications. The study was published in the journal Nature Photonics.

Semiconductors underpin modern optoelectronic devices, yet the industry continues to face challenges in improving processing speed while reducing energy consumption. To overcome these limitations, researchers are exploring new approaches, particularly spin-based technologies. However, manipulating spin states at room temperature remains extremely difficult due to the rapid spin decoherence process.

To address these challenges, the HKUST research team developed a novel perovskite chiral multiple quantum-well system that enables an efficient “spin cascade” process. Using a two-step seed-assisted crystallization approach, the team constructed well-oriented quantum wells with varying widths and continuous intrinsic chirality across two-dimensional (n = 1), quasi-two-dimensional (n = 2, 3, 4, …) and three-dimensional (n = ∞) perovskite phases.

Light-pulse pairs reveal the femtosecond decay of an inner-shell hole in xenon atoms

Researchers at the UVSOR Synchrotron Facility (Institute for Molecular Science, Japan) and partner institutions have observed the decay of a xenon 4D core hole, an inner-shell vacancy, directly in the time domain. They used pairs of phase-coherent extreme ultraviolet pulses from a synchrotron to make the photoelectron wave packets they released interfere. The contrast of the interference fringes decreased over a few femtoseconds as the delay between the pulses increased. A model using literature core-hole lifetimes of about 6 femtoseconds reproduced this rapid decay of the fringe contrast. The study is published in the journal Physical Review A.

Auger decay is an ultrafast process. A valence electron fills an inner-shell vacancy, and another electron is ejected. It dominates the decay of the xenon 4D hole. Until the mid-2000s, experiments mostly inferred such dynamics from the spectral widths of photoelectron lines. Attosecond streaking later made time-domain observation possible. While attosecond streaking has been widely employed for time-domain observations of Auger processes, the research team has introduced an alternative approach based on coherent pulse pairs. The present work extends the photoelectron wave-packet interferometry to core holes created by photoionization.

At beamline BL1U of the UVSOR-III synchrotron, two undulators in tandem, separated by a phase-shifter magnet, emitted phase-coherent pulse pairs. The photon energy was 93.4 eV, with a bandwidth of about 3%. The phase-shifter magnet set the delay between pulses with attosecond resolution. The pulses ionized xenon 4D electrons, and a hemispherical analyzer recorded photoelectron spectra as a function of delay. Helium, which has no comparable decay, served as a reference. Its fringe contrast revealed the instrument’s own contrast loss.

Light reflecting within thin films can masquerade as molecular signals in perovskite solar materials

An infrared signal thought to reveal how molecules in perovskite solar materials respond to light-generated charges can arise largely from the way light travels through the thin film itself, a new theoretical study shows. Jun Nishida, assistant professor at the Institute for Molecular Science (IMS), Japan, found that light-generated charges alter how infrared light is reflected and transmitted within the film layers, producing sharp features that resemble changes in molecular vibrations even when the vibrations themselves are unaltered.

Published in The Journal of Chemical Physics and selected as an Editor’s Pick, the study names this mechanism carrier-induced photonic resonance (CIPR) and shows that it must be distinguished from genuine molecular responses when interpreting such measurements.