Table of contents : CONTENTS NEWS IN BRIEF News at a glance NEWS IN DEPTH Global project gears up to study vaccine safety Earth’s oldest land ecosystem spotted in drilled cores Thermal batteries could back up green power How a site peddles author slots in reputable publishers’ journals Bills to ease cannabis research advance in U.S. Congress Tiny labmade motors are poised to do useful work FEATURE Looking for trouble PERSPECTIVES The fascinating world of biogenic crystals Fullerenes make copper catalysis better Regulatory CD8+ T cells suppress disease Strong and fast hydrogel actuators Citizen science for studying earthquakes Complex regulation of fatty liver disease How the gut talks to the brain POLICY FORUM Getting genetic ancestry right for science and society BOOKS ET AL. Confronting climate injustice The complexity of chronic pain LETTERS Retraction Save Sri Lankan wildlife from foreign smugglers Scientists’ right to speak to the press Let’s not abandon Russian scientists Technical Comment abstracts RESEARCH IN BRIEF From Science and other journals REVIEW Evidence, causes, and consequences of declining nitrogen availability in terrestrial ecosystems RESEARCH ARTICLES Sphingolipids control dermal fibroblast heterogeneity Bacterial sensing via neuronal Nod2 regulates appetite and body temperature Inhibition of nonalcoholic fatty liver disease in mice by selective inhibition of mTORC1 KIR+CD8+ T cells suppress pathogenic T cells and are active in autoimmune diseases and COVID-19 Compartmentalized dendritic plasticity during associative learning Dynamic compartmental computations in tuft dendrites of layer 5 neurons during motor behavior REPORTS Allylic C–H amination cross-coupling furnishes tertiary amines by electrophilic metal catalysis Citizen seismology helps decipher the 2021 Haiti earthquake Ambient-pressure synthesis of ethylene glycol catalyzed by C60-buffered Cu/SiO2 Amplification of light within aerosol particles accelerates in-particle photochemistry Epithelial monitoring through ligand-receptor segregation ensures malignant cell elimination Hydrogel-based strong and fast actuators by electroosmotic turgor pressure Volumetric additive manufacturing of silica glass with microscale computed axial lithography Complex morphologies of biogenic crystals emerge from anisotropic growth of symmetry-related facets DEPARTMENTS Editorial Working Life Science Careers