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3D topological nodal lines that give rise to drumhead surface states could help study a range of exotic topological phenomena. Here, Deng et al. experimentally demonstrate 3D nodal ring dispersion and topological drumhead surface states for acoustic waves in a phononic crystal.

Despite long-standing theoretical predictions in graphene, observation of satellite Dirac cones surrounding a central linear cone is elusive. Here, the authors report their observation in phononic crystals by designing dominant third-nearest-neighbor couplings.

Loss plays an important role in topological physics. Here, the authors demonstrate how loss can delocalize topological boundary modes in non-Hermitian systems via theoretical modeling and implementation on passive electric circuits.

A second-order topological Weyl semimetal based on a 3D-printed acoustic crystal, exhibiting Weyl points, Fermi arc surface states, and hinge states, has been experimentally demonstrated.

In acoustic systems, quantum spin Hall physics is rarely observed because the crucial ingredient spin-orbit coupling is missing. Here, the authors construct an acoustic crystal with synthetic spin-orbit coupling and observe gapless helical boundary states as well as spin flipping effect.

Topologically protected edge states can be observed when combining two Si-based phononic crystals of opposite phases, as well as on-chip elastic wave splitting via partition of edges states at the intersection of topological channels.

Flash recycling method can achieve nondestructive cathode regeneration effectively with higher environmental and economic benefits over traditional destructive recycling processes.

Sustainable end-of-life management strategies for fibre-reinforced plastics are urgently needed from a sustainability perspective. Here the authors develop a solvent-free flash upcycling method, enabling ultrafast and efficient upcycling of fibre-reinforced plastics to fulfil such a need.

Non-trivial topological phases come in various guises from first-order to higher-order and can be found in a range of systems from electronic and photonic through to phononic. Here, the authors report a variable-order topological insulator in a phononic crystal that can be tuned between first and higher orders by varying the nearest-neighbor hopping whilst at the same time preserving the symmetry.

Recent theoretical works reveal that the topologically nontrivial exceptional points can guarantee the geometry-dependent skin effect, but it remains to be confirmed by experiments. Here the authors realize a reciprocal non-Hermitian phononic crystal with exceptional points, and observe the geometry-dependent skin effect.

Luis Pérez-Jurado, Stephen Chanock and colleagues detect clonal chromosomal abnormalities in peripheral blood or buccal samples from individuals in the general population. They show that the frequency of such events increases with age and is associated with elevated risk of developing subsequent hematological cancers.

Nanoscale carbides provide access to ultra-strong ceramics and show activity as high-performance catalysts. Here, the authors report a flash Joule heating process for the ultrafast, general synthesis of various transition metal carbides nanocrystals with phase controllability.

Coal fly ash (CFA) is an attractive cement diluent additive but contains heavy metals which could slowly leach out. Deng, Meng and colleagues report a rapid and water-free process to remove the heavy metals from CFA using flash joule heating. This approach reduces the energy consumption for CFA purification as well as other industrial wastes decontamination.

Genetic engineering of yeast enables the production of cannabinoids and cannabinoid analogues from the simple sugar galactose, without the need to cultivate Cannabis.

Point gap is signature of non-Hermitian systems, but the experimental identification of nontrivial point gaps is elusive. Here, the authors use a Weyl phononic crystal to demonstrate that the point gap constituted by bulk and Fermi-arc surface states can be observed experimentally by a real-space field mapping technique and discover various skin effects and their evolutions.

Topological pump offers a new perspective on the construction and application of topological states. Based on higher-order topological corner pump, the authors demonstrate some interesting transport phenomena (e.g., topological splitting effect) in a 3D modulated phononic crystal with arbitrarily controllable pumping paths.