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Physicists just found a tiny glitch in time itself

Quantum physics may place a fundamental limit on clock precision, hinting that time itself is not perfectly precise. Unconventional quantum theories may imply that time itself has a tiny fundamental uncertainty, placing an ultimate limit on how precisely any clock could measure it. The effect is far beyond current detection, but it could reveal a hidden connection between quantum mechanics, gravity, and spacetime.

Quantum mechanics has always challenged our everyday understanding of reality. In the quantum world, particles can exist in a superposition of states, meaning they can occupy multiple possible positions or configurations at the same time. Physicists describe these possibilities mathematically using a wavefunction.

That picture is very different from ordinary life, where an object appears to be in one place and one state at a time. To bridge that gap, standard quantum mechanics says that when a quantum system is measured or observed, its wavefunction collapses into a single definite outcome.

Caffeine may flip an ancient cellular switch linked to slower aging

Caffeine may help cells age more slowly by switching on a powerful energy and stress-response system. Scientists found that caffeine activates an ancient cellular energy system involved in stress resistance, DNA repair, and growth. The discovery could help explain caffeine’s links to healthier aging and may point toward new ways to target the same pathway.

Your morning coffee may be doing more than helping you wake up.

Research from Queen Mary University of London suggests that caffeine can activate an ancient cellular energy system involved in growth, stress resistance, and DNA repair. Those processes are closely tied to aging, which could help explain why caffeine has been linked to potential health benefits in earlier studies.

Cognitive Decline, Neurologic Involvement, and Neonatal Crisis in ABCC9-Related Intellectual Disability and Myopathy Syndrome

Background and ObjectivesThe ABCC9 gene encodes the widely expressed SUR2 subunit of ATP-sensitive potassium (KATP) channels. Autosomal recessive loss-of-function variants in ABCC9 cause ABCC9-related Intellectual disability and Myopathy Syndrome (AIMS)…

Lipid nanoparticles for mRNA delivery in brain via systemic administration

Cao et al. made lipid nanoparticles (LNPs) equipped with a small molecule ligand for blood-brain-barrier (BBB) 5-HT3 receptor and a cell penetrating peptide known as Tat. These LNPs crossed the BBB in mice more efficiently than control formulations.

Peptide-modified lipid nanoparticles enable systemic IL-12 mRNA delivery for glioblastoma treatment.

The Turbulent Life of a Vortex Line

A tabletop experiment using a classical water vortex supports a decades-old theory describing the decay of turbulence in quantum fluids.

When you pull the plug at the end of a relaxing bath, a vortex forms as water drains through the plughole. If you watch carefully, the slender whirlpool may begin to wobble, with helical, corkscrew-like disturbances traveling along its length. In 1880, William Thomson, who later became Lord Kelvin, showed mathematically that a straight vortex filament can support such helical waves [1]. Today, Kelvin waves are thought to hold the key to one of the outstanding puzzles of quantum turbulence: how the kinetic energy of an agitated quantum fluid is ultimately dissipated. Now Eric Falcon of Paris Cité University and his colleagues have directly observed Kelvin-wave turbulence using a vortex no more exotic than one found in a bathtub [2].

Kelvin waves are particularly important in superfluids, ultracold atomic gases, and the interiors of neutron stars. Rather than being spread throughout the fluid, superfluid vorticity is confined to thin, line-like topological defects, each carrying a fixed quantum of circulation (Fig. 1) [3]. A tangle of these so-called quantum vortices forms quantum turbulence—“superfluid spaghetti”—first envisaged by Richard Feynman in the 1950s [4]. This picture raises a fundamental question about the fate of the energy stored in the vortex tangle. In classical turbulence, energy cascades to small scales where it is dissipated by viscosity. But an ultracold superfluid is inviscid. How, then, does turbulent motion in a superfluid eventually decay?

Nuclear-spin swap extends room-temperature entanglement lifetime up to 240-fold

Researchers in China have extended the lifetime of entanglement in a room-temperature, solid-state system by up to a factor of 240. Led by Shuo Ren and Rui-Jian Liang at the University of Science and Technology of China in Hefei, the team transferred entangled states from the electron spins of solid-state defects to the spins of surrounding atomic nuclei, which are far more resilient to noise. The research has been published in Physical Review Letters.

When two or more quantum particles are entangled, their properties remain correlated no matter how far apart they are: Measuring one immediately tells you something about its entangled partners. This phenomenon is increasingly being explored for quantum sensing and information processing, where entangled networks of quantum bits, or “qubits,” can perform tasks beyond the limits of classical systems.

The enduring challenge is that quantum information is quickly destroyed as qubits interact with thermal fluctuations in their surroundings. This noise can be minimized by cooling systems to ultracold temperatures—but today, physicists are also exploring more practical approaches, in which qubits have built-in resilience against their environment while still allowing information to be easily written and read out.

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