Isotopes are atoms of the same element with identical proton numbers but different neutron counts. Stable isotopes, with half-lives longer than 10¹⁵ years, undergo negligible radioactive decay. For elements of the third Period and beyond, their isotopes usually show minor differences in physical properties and are considered chemically identical in many previous studies.

The assumption does not always hold.

A research team led by Prof. Sen Xin from the Institute of Chemistry, Chinese Academy of Sciences have recently revealed that two stable sulfur isotopes (³⁴S and ³²S) exhibit significant differences in both kinetics and thermodynamics of participating the electrode reactions in a rechargeable Li-S battery. The (dis)charge process of Li-S batteries usually involves generation and dissolution of high-order lithium polysulfide intermediates (Li₂S_n, 4≤n≤8) at the cathode-electrolyte interface, and diffusion of Li₂S_n through the liquid electrolyte to reach the Li-metal anode. The above process forms the main reason for rapid capacity decline of the S cathode and exothermic parasitic reactions on the surface of Li anode. By employing the time-of-flight secondary ion mass spectrometry and inductively coupled plasma-mass spectrometry, the team has proven that the ³⁴S-based polysulfides (Li₂³⁴S_n) migrate slower than the ³²S-based polysulfides, which accounts for improved battery performance and isotope fractionation at both electrodes.

Large and complex construction projects (LCCPs) require substantial investments and often encounter significant challenges, such as cost overruns, time delays, and conflicting stakeholder interests. A new study reviews 165 peer-reviewed publications to propose a modernized value management framework tailored for LCCPs, paving the way for improved stakeholder collaboration and technological integration.

Psittacosaurus was a genus of herbivorous dinosaurs that lived in the Early Cretaceous. Since the first report of Psittacosaurus discoveries in Mongolia a century ago, at least 12 valid species have been recognized to date. The unearthed fossils cover a complete developmental sequence from newly hatched juveniles to adult individuals. Recently, a joint research team from the Dinosaur Evolution Research Center of Jilin University and the University of Toronto Mississauga analyzed 13 juvenile Psittacosaurus fossils from the same nest, all containing gastroliths. The findings have significantly reshaped the traditional understanding of their feeding behavior—even individuals under one year of age ingested gastroliths to aid in digesting tough, fibrous plants. Lithological analysis of these gastroliths indicates that the juveniles likely obtained the stones locally, with their activity confined to the western Liaoning region and showing no evidence of long-distance migration. This study highlights a relatively stable feeding strategy throughout the life cycle of  Psittacosaurus, providing key insights into reconstructing the paleoecological evolution of early ceratopsians. The research has been published in SCIENCE CHINA Earth Sciences.