This review paper presents in more detail the key points of the Brindley Award lecture given at the 61st Annual Meeting of The Clay Minerals Society and 5th Asian Clay Conference in Honolulu in June 2024. It is focused on the research of the author, even though it credits earlier findings. The paper discusses first the definition of illite, its position in mineral classification, the distinction between illite and true micas, the illite crystal-growth mechanism, and the specific properties of illite, resulting from its small crystal size. Second, this review presents evidence and explanation for the exceptional abundance of this mineral on Earth’s surface. Third, the behavior of illite in the rock cycle is characterized: in weathering, in sedimentation, and in diagenetic, metamorphic, and hydrothermal environments. Finally, the exceptional role of illite in geochemical cycling of water and elements K, N, B, Rb, and Cs is presented.

In reaction to revolutionary upheaval in the 1790s and 1800s, the British parliament at home and colonial legislatures in the Americas passed their first statutory provisions to govern migration and aliens as such. As this paper argues, in their sustained and varied uses, these “alien acts” were much more than about border and migration controls. In a period of fundamental restructuring of imperial rule and of social statuses within the colonies, they increasingly turned into flexible tools of imperial governance. Taking the British Caribbean in the 1820s and 1830s as a case, the paper examines how alien legislation was reused, and reinvented, in two crucial arenas of imperial reconfiguration: the push for political equality by free people of color and the abolition of the slave trade. By their emphasis on sweeping executive power, various actors on the ground but also in the metropole regarded alien acts as an appropriate legal tool to respond to, to avert or subvert what they regarded as challenges or legal complexities of the age of emancipation. In this way, the alien acts also became a central factor in the reconfiguration of British subjecthood—with far-reaching consequences that their creators and users could never fully anticipate or control.

The article analyses the Jewish militias that were established in Galicia during the fall of the Habsburg empire in 1918 and the creation of new nation-states. As public order collapsed and the region descended into violence, Jews throughout Galicia took up arms to protect and organize their communities and to take an active part in the transformation of the region. They mirrored the efforts of their non-Jewish neighbors, creating paramilitary forces that aimed to fill the vacuum left behind by the disintegrating imperial state. The militias were more than a means of self-defense. They actively participated in the establishment of the new states’ monopoly on violence but did so on their own terms—integration was only possible through separation. At the same time, the militias served a decidedly internal, Jewish purpose by replacing traditional leaderships and imposing discipline in the community, at times through universal conscription.

The effects of abomasal infusion of corn starch and β-hydroxybutyrate (BHB) on hindgut microbial fermentation characteristics and end-products in early lactation dairy cows were determined via in vitro gas production (GP). Four substrates, either fibre or starch sources differing in expected rate of degradability (slow – cellulose and corn grain; rapid – beet pulp and pregelatinized corn flour), were incubated with faecal inoculum from cows abomasally infused with water only, 1.5 kg corn starch/d + 0.0 mol BHB/d, 3.0 kg corn starch/d + 0.0 mol BHB/d, 0.0 kg corn starch/d + 8.0 mol BHB/d, 1.5 kg corn starch/d + 8.0 mol BHB/d, or 3.0 kg corn starch/d + 8.0 mol BHB/d in a 6 × 6 Latin square design. In vitro GP was measured using an automated GP system with methane (CH4) measured at specific times. After 72 h, volatile fatty acids (VFA), pH, ammonia, and in vitro organic matter digestibility (IVOMD) of incubation fluid were determined. Infusion of BHB had limited effect on hindgut microbial fermentation. Infusion of 3.0 kg corn starch/d increased GP at 3 h of incubation for all substrates but resulted in lower total GP, CH4 production, pH, ammonia concentration, and IVOMD after 72 h, while increasing total VFA concentration and molar proportions of propionate and butyrate vs. 0.0 and 1.5 kg corn starch/d infusions. Among substrates, IVOMD of cellulose was most affected by 3.0 kg corn starch/d infusion. Results suggest that in vitro fermentative activity of hindgut microbes decreases when higher levels of starch enter the hindgut.

This paper presents an experimental and analytical investigation into the use of trailing edge slits for the reduction of aerofoil trailing edge noise. The noise reduction mechanism is shown to be fundamentally different from conventional trailing edge serrations, relying on destructive interference from highly compact and coherent sources generated at either ends of the slit. This novel approach is the first to exploit the coherence intrinsic to the boundary layer turbulence. Furthermore, the study demonstrates that trailing edge slits not only achieve superior noise reductions compared with sawtooth serrations of the same amplitude at certain conditions, but also offer frequency-tuning capability for noise reduction. Noise reduction is driven by the destructive interference between acoustic sources at the root and tip of the slit, which radiate with a phase difference determined by the difference in times taken for the boundary layer flow to convect between the root and tip. Maximum noise reductions occur at frequencies where the phase difference between these sources is $180^\circ$. The paper also presents a detailed parametric study into the variation in noise reductions due to the slit length, slit wavelength and slit root width. Additionally, a simple two-source analytic model is proposed to explain the observed results. Wind tunnel measurements of the unsteady flow field around the trailing edge slits are also presented, providing insights into the underlying flow physics.

Both gesture and talk are basic building blocks of face-to-face conversation. In this study, we address the temporal dynamics of hand gesture phases relative to places and types of turn transition. We annotated gesture features and measured temporal aspects of gesture related to speech in two languages, German and Swedish. We found variation in the temporal relationships of gesture types and alignment of gesture phases that relate to the management of turn-taking in conversation. Specifically, the frequency of different gesture phases accompanying the offset of speech differed depending on whether the same speaker held the floor or whether a new speaker took up a turn. In addition, we found that differences in temporal alignment of gesture phases can distinguish between the type of turn transition that is upcoming up to a second before the place of transition is reached. Our results emphasize the importance of the interaction of the verbal and the gestural modality to maintain the smooth flow of conversation.

The study explores the vertical stratification of microbial diversity and metabolic potential in Earth’s lower atmosphere. Using 16S rRNA sequencing data spanning the planetary boundary layer to the lower stratosphere, we conducted taxonomic profiling and metabolic pathways predictions. The aim was to elucidate microbial community dynamics and their ecological roles under diverse atmospheric conditions. Methods: 51 Publicly available datasets with 3584 samples were retrieved from repositories such as Sequencing Read Archive and European Nucleotide Archive, filtered for studies employing 16S rRNA sequencing. Quality control was performed using FastQC and Trimmomatic, followed by taxonomic classification with Qiime2 and the Silva132 database. Functional pathway predictions were derived using PICRUSt2, and statistical analyses included Kruskal-Wallis tests for diversity comparisons and Mann-Whitney U tests for pathway activity. Results: Microbial diversity decreased with altitude, with the Surface Layer exhibiting the highest Shannon diversity and the significantly decreased in Low Stratosphere. Taxonomic composition shifted along the elevation gradient, with Actinobacteria and Alphaproteobacteria predominant at lower altitudes. In contrast, Bacilli and Gammaproteobacteria became more dominant at higher elevations, though they maintained a notable presence at lower sites as well. Functional analysis revealed altitude-specific adaptations, including significant upregulation of CO2 fixation pathways in the Free Troposphere Transition Layer and secondary metabolite biosynthesis in the lower stratosphere. Discussion: These findings reveal distinct microbial metabolic profiles across atmospheric layers with varying conditions such as oxygen levels, UV radiation, and nutrient availability. While these differences may represent adaptive strategies, they could also reflect source environment characteristics or selective transport processes. The conserved metabolic pathways across altitude layers suggest functional resilience despite taxonomic divergence. These results have implications for astrobiology, providing analogs for microbial life in extraterrestrial environments like Mars or Europa. In summary, this study advances our understanding of aerobiomes’ ecological roles and their potential as models for life detection in extreme environments, bridging atmospheric microbiology with astrobiological exploration.