From the Shark Nebula to a new wildcat: the science behind Nature's September image roundup

A DNA study captured, for the first time in an atomic-force micrograph, two helical double strands 'zipping up' next to each other, with computer simulations confirming that the groove-to-groove pairing is facilitated by positive ions such as calcium and magnesium stuck in between, even though both strands carry negative charges that would usually repel each other. Earlier work on how double strands approach and pair relied largely on indirect evidence or simulation; this provides direct micrographic evidence plus an ion-mediated mechanism. Atomic-force micrography corroborated by computer simulation; researcher Agnes Noy notes these regions may become particularly important when mutations disrupt normal cellular processes and contribute to cancer.

A predator smaller than a domestic cat and covered in leopard spots, found on the eastern slope of the Bolivian Andes, has been confirmed as new to science and named Leopardus tilcayo, the first felid described scientifically in more than 100 years. Biologist Paola Nogales-Ascarrunz had initially identified it as an oncilla (Leopardus tigrinus), then suspected it was a different species; she and collaborators conducted a genomic analysis of the animal and its relatives, including eight genomes from museum specimens, and found it new to science. Based on genomic analysis including eight museum-specimen genomes; tilcayo is the common name given to the animal by the local population.

Researchers at the University of Lausanne and the Summit Foundation in Vevey are experimenting with thick woollen blankets to slow snowmelt on the Tsanfleuron Glacier in the western Alps, aiming to find an environmentally friendly substitute for synthetic tarpaulins and a use for some of Switzerland's wool output, at least 40% of which is discarded every year. Shifts glacier covering from synthetic material to wool, addressing both glacier loss and discarded wool. The report describes an ongoing trial and gives no quantitative result on melt reduction.

Excavation of the cavern for Japan's Hyper-Kamiokande neutrino detector, 650 metres under Nijuugo Mountain, was completed in mid-2025 and the cavern lining finished two months ago; from 2028 it will be filled with 260,000 tonnes of water to collect subatomic particles from sources including artificial beams and supernova explosions. It is five times larger than its sister detector Super-Kamiokande, where neutrino oscillations were discovered, showing that neutrinos have mass, a finding that earned the 2015 Nobel Prize in Physics. The report gives engineering progress, scale and timeline; no detection results yet.

This roundup is aimed at general readers and cross-disciplinary researchers who want a quick view of September's science images and related developments; it suits overview rather than methodological detail. The DNA pairing, the new felid and the glacier trial map onto structural biology, taxonomy and alpine glacier protection respectively, while Hyper-Kamiokande and Starship are engineering and facility milestones.

The report gives no melt-reduction data from the wool-blanket glacier trial and no detail on the scale or specific conclusions of the genomic analysis of the new felid; Starship's first orbital flight is summarised without orbital parameters, satellite counts or reentry detail; the cause of the Nepal mudflow is stated as possible, and the death and missing figures are as reported at the time. These await later reporting or the original papers.