One of the greatest mysteries of our planet is how a soup of lifeless chemicals transformed into the first living cell. There are several competing theories about where this happened, from frozen polar ice to superheated hydrothermal vents. But one thing that most scientists agree on is that life could not begin until a molecule appeared that could spontaneously copy itself.

To lower agricultural emissions, policymakers and communities first need to pinpoint the sources—not just by country but crop by crop, field by field. In a study published in Nature Climate Change, researchers have synthesized data from multiple ground sources and models to map global cropland emissions at high resolution—down to about 10 kilometers—while breaking down emissions by crop and source and identifying regions for more precise mitigation.

Researchers at University of Tsukuba have uncovered a master transcriptional regulator that controls rhizobial symbiosis between plants and nitrogen-fixing bacteria. By identifying an amino acid motif that emerged before the appearance of rhizobial symbiosis, they show that stabilization of DNA binding enabled this regulator to control a wide array of genes involved in nodule formation, bacterial infection, and symbiotic nitrogen fixation.

Time crystals could one day provide a reliable foundation for ultra-precise quantum clocks, new mathematical analysis has revealed. Published in Physical Review Letters, the research was led by Ludmila Viotti at the Abdus Salam International Center for Theoretical Physics in Italy. The team shows that these exotic systems could, in principle, offer higher timekeeping precision than more conventional designs, which rely on external excitations to generate reliably repeating oscillations.

Controlled manipulation of fibers that are as thin as or even thinner than human hair is a real challenge. Despite technological development, the precise and reversible change of the microfibers' orientation is not easy. The interdisciplinary team of researchers from the Institute of Physical Chemistry, Polish Academy of Sciences, has recently developed a way to control the shape of microfibers with electricity. This brings us closer to a novel technical solution in micromechanics and soft robotics.

Researchers from the University of Tartu Institute of Physics have developed a novel method for enhancing the quality of three-dimensional images by increasing the depth of focus in holograms fivefold after recording, using computational imaging techniques. The technology enables improved performance of 3D holographic microscopy under challenging imaging conditions and facilitates the study of complex biological structures.

Gray wolves adapt their diets as a result of climate change, eating harder foods such as bones to extract nutrition during warmer climates, new research has found. The study, led by the University of Bristol in collaboration with the Natural History Museum, and published in Ecology Letters, has implications for wolf conservation across Europe and beyond.

With a few minutes of searching, anyone can find videos online of chatty birds: macaws talk to their keepers, cockatoos sing to the camera, corvids mimic the jarring sounds of construction sites. Research has shown that some birds can understand and use words in context—so, when Polly speaks up from inside her cage, she may really want a cracker—but scientists know far less about how birds use their vocal abilities in the wild. Christine Dahlin, professor of biology at the University of Pittsburgh at Johnstown, is working to change that.

Humans develop sharp vision during early fetal development thanks to an interplay between a vitamin A derivative and thyroid hormones in the retina, Johns Hopkins University scientists have found. The findings could upend decades of conventional understanding of how the eye grows light-sensing cells and could inform new research into treatments for macular degeneration, glaucoma, and other age-related vision disorders. Details of the study, which used lab-grown retinal tissue, are published today in Proceedings of the National Academy of Sciences.

Environmental pollutant analysis typically requires complex sample pretreatment steps such as filtration, separation, and preconcentration. When solid materials such as sand, soil, or food residues are present in water samples, analytical accuracy often decreases, and filtration can unintentionally remove trace-level target pollutants along with the solids.