Brain imaging and stimulation identify circuits that help us distinguish the consequences of our own choices from events beyond our control.

Worried about hidden meat spoilage risks in cold chains? This new study in Engineering develops a microwave sensor paired with machine learning to spot ammonia, a key rot marker, without damaging meat samples. It fixes reading errors caused by shifting temperature and humidity, cutting detection error to only 0.06 ppm and boosting accuracy by 31.11%. The wireless device works up to 12 meters away, offering a practical tool for real-time fresh meat quality tracking across storage and transport.

With the rapid development of 6G space–air–ground integrated communication networks, low Earth orbit (LEO) satellite constellations, leveraging their advantages of wide-area coverage and freedom from geographic constraints, have become key infrastructure for achieving global seamless connectivity. However, due to the relative motion among satellites in different orbits, inter-satellite links (ISLs) exhibit periodic dynamic on–off characteristics, among which a portion of the interruptions are predictable topological changes. Conventional Open Shortest Path First (OSPF) protocols compute shortest paths solely based on link distance, without considering link effective duration or bandwidth constraints, rendering them inadequate for adapting to the dynamic topological characteristics of satellite networks. Although fast reroute strategies can address sudden link failures, they consume substantial bandwidth resources and cannot provide protection for all nodes across the entire network. Therefore, how to proactively switch service paths before predictable link interruptions occur, so as to minimize service disruption and resource overhead, has become a core issue in ensuring service continuity in LEO satellite networks.

Surface ozone has overtaken fine particles as China’s top air pollutant despite falling PM₂.₅ levels. This new analysis in Engineering unpacks the tricky chemical link between NOₓ, VOCs and rising ozone, plus two practical fixes. Deep cuts to nitrogen oxides offer an immediate, workable control path for cities, while energy-free catalytic wall coatings can locally break down ozone cheaply. Read on to learn how these dual strategies ease nationwide ozone pollution.