A new species of syngnathiform fish, Gerpegezhus daniaoriundus n. sp., from the Eocene Fur Formation of Denmark is described herein. The description is based on 17 specimens preserved in either soft diatomite or carbonate concretions. The two lithologies result in different preservation of the morphological features. Gerpegezhus daniaoriundus n. sp. exhibits a set of diagnostic features of the extinct monotypic family Gerpegezhidae and of the genus Gerpegezhus, including (1) greatly elongated body, (2) presence of ossified myoseptal tendons, (3) lower procurrent caudal-fin rays absent, (4) dorsal- and anal-fin spines absent, and (5) pelvic fin and girdle absent. It can be separated from the species Gerpegezhus paviai by having a much slenderer body bearing unpaired leaf-like appendages protruding from its ventral side, and completely different meristic values, including up to 39 (or 40) vertebrae, a total of 16 unbranched caudal-fin rays, dorsal and anal fins with 5 and 16 unbranched rays, respectively, and a different organization of body armor comprising two dorsal bilateral series of dermal plates. The occurrence of the genus Gerpegezhus from the Fur Formation provides a remarkable example of the biogeographic relationships between the North Sea realm and the Tethys in the earliest Eocene.

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We study the behaviour of (resonant) dynamic B-tipping in a forced two-dimensional nonautonomous system, close to a nonsmooth saddle-focus (NSF) bifurcation. The NSF arises when a saddle-point and a focus meet at a border collision bifurcation. The emphasis is on the Stommel 2-box model, which is a piecewise-smooth continuous dynamical system, modelling thermohaline circulation. This model exhibits an NSF as parameters vary. By using techniques from the theory of nonsmooth dynamical systems, we are able to provide precise estimates for the general tipping behaviour close to the bifurcation as parameters vary. In particular, we consider the combination of both slow drift and also periodic changes in the parameters, corresponding, for example, to the effects of slow climate change and seasonal variations. The results are significantly different from the usual B-tipping point estimates close to a saddle-node bifurcation. In particular, we see a more rapid rate of tipping in the slow drift case, and an advancing of the tipping point under periodic changes. The latter is made much more pronounced when the periodic variation resonates with the natural frequency of the focus, leading both to much more complicated behaviour close to tipping and also significantly advanced tipping in this case.

Recently, the Kac formula for the conditional expectation of the first recurrence time of a conditionally ergodic conditional expectation preserving system was established in the measure-free setting of vector lattices (Riesz spaces). We now give a formulation of the Kakutani–Rokhlin decomposition for conditionally ergodic systems in terms of components of weak order units in a vector lattice. In addition, we prove that every aperiodic conditional expectation preserving system can be approximated by a periodic system.

We prove almost global well-posedness for quasilinear strongly coupled wave-Klein-Gordon systems with small and localized data in two space dimensions. We assume only mild decay on the data at infinity as well as minimal regularity. We systematically investigate all the possible quadratic null form type quasilinear strong coupling nonlinearities.

A key feature of the paper is our new, robust approach to the vector field method, which enables us to work at minimal regularity and decay in a quasilinear setting, and which, we believe, can be applied for a much wider class of problems.

An analytical expression for focal intensity is derived for arbitrary surface profiles and arbitrary groove patterns of compressor gratings. The expression is valid for different compressor designs: plane and out-of-plane compressors, symmetric and asymmetric compressors (compressors composed by two not-identical pairs of gratings) and a two-grating compressor. It is shown that the quality requirements for the optics used to write a grating are higher than for the grating. The focal intensity can be maximized by rotating each grating around its normal by 180 degrees. Moreover, it may be increased to maximum by interchanging any two gratings in the compressor, because imperfections of an individual grating do not additively affect the focal intensity. The intensity decrease is proportional to the squared pulse spectrum width and the squared total distortions of the second and third gratings of the four-grating compressor and the total distortions of two gratings of the two-grating compressor.

Rivers act as long-term plastic storage and a pathway for land-based plastic pollution into the ocean. Monitoring river plastic at a global scale remains challenging, with only limited large-scale and long-term monitoring efforts to date. Citizen science approaches may ensure a more continuous basic knowledge of plastic pollution in rivers, which can be used to assess the efficacy of reduction measures. We evaluated the suitability of several river plastic monitoring methods for citizen science, through field monitoring and a subsequent survey with citizen scientists in Accra, Ghana. Four measurement techniques (visual counting, macroplastic net sampling, microplastic net sampling and hydrometric measurements) were tested in the field and evaluated by citizen scientists. The visual counting method, used to estimate floating macroplastic transport, emerged as the most promising method for citizen science–based river plastic monitoring. Using the data collected by citizens, we quantify the variability in transport and concentration of both macroplastic and microplastic.

College students gain a considerable amount of weight by consuming unhealthy food. Many universities adopt costly programs to alleviate this problem. We study the effect of a simple, inexpensive option: moving unhealthy items out of sight. The opportunity to investigate this intervention comes from the decision of a dining hall in the University of New Hampshire that relocated cookies from a main section in plain sight to an out-of-the way corner. The cost of cookies did not change, since the dining hall operates as an “all that you can eat” restaurant. Relative to pizza, a product that did not change location, the consumption of cookies dropped by up to 22% relative to their predicted level had the relocation not taken place. We see this as evidence that simple changes in design can nudge students towards healthy eating.

Malacostracan crustaceans are very diverse today, but their evolutionary history and biodiversity during the Paleozoic remain understudied. One clade within Malacostraca is Belotelsonidea, crustaceans with a shrimp-like body plan only known from the Carboniferous. We describe the fourth species of this group, Lobetelson feldmanni n. sp., from the Pennsylvanian (Kasimovian) of the Kinney Brick Quarry, New Mexico, USA. The holotype is a flattened, relatively complete specimen with an eye preserved. A second, less well-preserved specimen from the same locality might be referable to the new species. This record represents the youngest record of Belotelsonidea, now ranging from the upper Tournaisian to the Kasimovian, equivalent to ca. 40 Myr. Paleobiogeographically, belotelsonids are only known from Scotland and various parts of the USA thus far, located near the equator to ~20° south during the Carboniferous. Whereas most belotelsonids are thought to have lived in a marine environment, some of the oldest specimens from Scotland are interpreted to have inhabited areas with limited to no marine influence.

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In this work, we focus on stochastic modeling for sustainable systems and introduce the family of r-modified reliability systems. This new family generalizes classical reliability systems studied in the literature by considering the components in the system to exhibit a kind of dependence that relaxes the component operating requirements and provides energy and resource efficiency. From a theoretical viewpoint, such a dependence is modeled with the use of a modified binary sequence. We then derive the reliability of two members of the family, i.e., the r-modified-k-out-of-n:F system and the r-modified-consecutive-k-out-of-n:F system, under different assumptions on the component reliabilities by using a variety of approaches, including Markov chains, combinatorial methods, and simple probabilistic arguments. We finally give some examples of real-life systems wherein the developed models and results are applicable and present the corresponding numerical results.

Parachute science is the problematic and extractive practice of non-local researchers taking data, knowledge and information from communities of which they are not members, failing to engage the local community and local scientists, marginalizing them in most aspects of the research, and using the results to their own benefit. Perpetuated by colonialism and unequal access to resources such as funding, education and data, it is harmful to local scientists and undervalues the contributions of the community as a whole. Ultimately, it erodes trust within the scientific community and, more broadly, builds dependence on foreign researchers and makes science less global and collaborative. Increasing international and cross-cultural collaborations while being careful to avoid parachute science can help minimize these impacts. Here, we offer our perspectives on parachute science and suggestions on how to avoid it, based on our experiences conducting research internationally with diverse scientists and communities, including both academics and non-academics. Instead of a parachute, we suggest opening the scientific “umbrella” to incorporate diverse perspectives and local contributions in generating relevant and impactful scientific insight.

We theorize party attention to gender issues within the responsibility-versus-responsiveness framework, deriving and testing novel hypotheses in six Western Balkan countries (2012–2021) that aspire to European Union (EU) membership. We analyse gender-related responsibility in European Commission (EC) recommendations and examine party discourse to assess whether, how and to what extent parties and the EC align under conditions of supportive/opposing public opinion (responsiveness). Generally, attention to gender issues is low, especially on controversial topics like LGBTIQ+ rights (‘thick’ gender equality), compared to broadly accepted women’s rights (‘thin’ gender equality). Governing status influences attention to ‘thin’ gender issues, while ‘thick’ issues are highlighted mainly by green/alternative/libertarian (GAL) opposition parties. Our study advances knowledge of how public opinion, governing/opposition status and party ideology shape party attention to gender issues in aspiring EU members.

Two states can have several bilateral agreements between them, some of which are legally binding and others are not. Is there a discernible pattern to how states structure the chronological sequence of binding and non-binding agreements governing a specific issue area? For example, do states prioritise a framework treaty to establish the foundation of their cooperation and let bureaucrats iron out details in non-binding instruments? Or do they first experiment with low-commitment agreements before eventually settling on a more permanent treaty? This paper explores these questions using the example of space governance, which is characterised by a high number of bilateral agreements. Examining space agreements between 287 state dyads, it argues that a combination of power asymmetry and trust levels influences the likelihood of certain types of sequences of binding and non-binding agreements. These findings are particularly relevant to the literature on informal governance, regime complexes, and space politics.

Recent experimental research suggests that when women stand as political candidates, they often enjoy more support amongst voters than men. However, women remain under-represented in politics worldwide, and observational research suggests sexism is prevalent and consequential for voter behaviour. Here, we attempt to bridge these contradictory findings and offer observational evidence of approximately 26,000 voters and 5,346 candidates in Australia, Canada, Britain, and the USA. American voters are slightly more likely to vote for a woman than a man, but we find no evidence of gender preference in the other countries. Interestingly, although sexism is prevalent in all four countries, we find no evidence for an effect of voter sexism on support for women candidates. We do find evidence that abstention, at least in the USA, is an important electoral choice for sexist partisans faced with a woman co-partisan candidate.

I champion a deliberative right to constitutional silence. It entitles individuals to reflect upon the arguments and reasons in favour or against changing or re-interpreting constitutional content under proper conditions. After reflecting on the place of silence in intellectual history and its features and virtues, I define the right to constitutional silence. It has four components: salience, time, reflection and publicness. Next, I discuss its grounds. I argue that it is an institutional legal right that citizens have in a deliberative constitutional democracy. This entails that, while there is a moral case for the right to silence, I here circumscribe my argument to the province of legality and constitutionalism. I finish discussing matters of institutionalisation. I offer three suggestions: two proposals about content and one about procedure. First, the right to silence applies primarily to deliberations about ‘thin’ constitutional matters found in preambles and introductory sections of constitutions. Second, it warrants public intervention in matters of public discourse of constitutional import, to avoid private power from interfering with the people’s sphere of constitutional reflection. Third, I adapt a proposal made elsewhere and suggest that a non-decisional interpretive mini-public could be a place to implement the right to silence.