News & Views in 2021

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  • Single-molecule experiments can now quantify the surface forces that compete to package tethered DNA into a protein-rich condensate — providing much-needed mechanistic insight into the phase behaviour of the entangled genome in the nucleus.

    • Marina Feric
    News & Views
  • Cells moving on microprinted tracks reveal a preference for regions that they have already visited, suggesting an update to a century of dynamical models for cell trajectories.

    • Henrik Flyvbjerg
    News & Views
  • The ATLAS Collaboration has confirmed with top quark events that the coupling of charged leptons to the weak interaction is universal — showcasing the feasibility of performing high-precision electroweak measurements at proton–proton colliders.

    • Florencia Canelli
    • Benjamin Kilminster
    News & Views
  • Nonlinearity and topology are both linked to symmetries, but what happens when the two are combined is not a trivial question. In a nonlinear photonic higher-order topological insulator, solitons localize on the corners together with the topological modes.

    • Grazia Salerno
    News & Views
  • Light pulses transiently change a metal to an insulator by unveiling a hidden ordered state.

    • Chong-Yu Ruan
    News & Views
  • Many aspects of gauge theories — such as the one underlying quantum chromodynamics, which describes quark physics — evade common numerical methods. Tensor networks are getting closer to a solution, having successfully tackled the related problem of a three-dimensional quantum link model.

    • Mari Carmen Bañuls
    • Krzysztof Cichy
    News & Views
  • The two-fluid model of superfluids predicts a second, quantum mechanical form of sound. Ultracold atom experiments have now measured second sound in the unusual two-dimensional superfluid described by the Berezinskii–Kosterlitz–Thouless transition.

    • Sandro Stringari
    News & Views
  • Introducing non-local effects to metamaterials increases the complexity of their dispersion relation, which allows carefully designed elastic structures to mimic the peculiar roton behaviour of correlated quantum superfluids.

    • Romain Fleury
    News & Views
  • High-order harmonics of laser pulses yield spectral components with shorter wavelength and duration and tighter focus than the original pulse. Precise spatiotemporal characterization of this radiation from a relativistic plasma mirror is relevant for ultrafast science.

    • Laszlo Veisz
    News & Views
  • Recent measurements of observables related to proton and neutron spin properties at low energies are in disagreement with the available theoretical predictions, and continue to challenge nuclear experimentalists and theorists alike.

    • Mohammad W. Ahmed
    News & Views
  • On the face of it, characterizing quantum dynamics in the exponentially large Hilbert space of a many-body system might require prohibitively many experiments. In fact, the locality of physical interactions means that it can be done efficiently.

    • Vedran Dunjko
    News & Views
  • A life-or-death choice determines the fate of reproductive cells. It has long been assumed that the choice is genetically regulated, but it now seems that the decision may instead be controlled by intracellular pressure.

    • Kacy L. Gordon
    News & Views
  • A type of polar self-propelled particle generates a torque that makes it naturally drawn to higher-density areas. The collective behaviour this induces in assemblies of particles constitutes a new form of phase separation in active fluids.

    • Olivier Dauchot
    News & Views
  • Quantum gates on trapped ions may be quicker and more reliable owing to squeezing of their vibrational motion. A threefold drop in operation time shows potential for applications in quantum technologies.

    • Klaus Mølmer
    News & Views