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In this episode: 0:46 Turning a toxic by-product into iron Red mud is a toxic by-product of aluminium manufacture, and millions of tonnes of it is produced each year. The majority ends up in landfills, pumped into vast lakes or stored in dried mounds, posing a serious environmental risk. This week, researchers demonstrate how red mud can be reused to make iron, a vital component in the production of steel. As their method uses hydrogen plasma rather than fossil fuels, they suggest it could be a way to reduce the carbon emissions associated with the steelmaking industry. Research article: Jovičević-Klug et al. https://www.nature.com/articles/s4158... News and Views: Iron extracted from hazardous waste of aluminium production https://www.nature.com/articles/d4158... 09:36 Research Highlights The economics of next-generation geothermal power plants, and the folded-fabric robot that crawls like a snake. Research Highlight: Flexible geothermal power makes it easier to harness Earth’s inner heat https://www.nature.com/articles/d4158... Research Highlight: Origami fabric robot slithers like a snake https://www.nature.com/articles/d4158... 20:53 Briefing Chat A computational model that predicts a person's likelihood of developing long COVID, NASA finally crack open the lid of OSIRIS-REx’s sample container, and how the ‘Moon Sniper’ craft pulled off the most precise lunar landing ever. Nature News: Long-COVID signatures identified in huge analysis of blood protein https://www.nature.com/articles/d4158... Johnson Space Centre: NASA’S OSIRIS-REx Curation Team Reveals Remaining Asteroid Sample https://www.nasa.gov/image-article/na... Nature News: Japan’s successful Moon landing was the most precise ever https://www.nature.com/articles/d4158... Subscribe to Nature Briefing, an unmissable daily round-up of science news, opinion and analysis free in your inbox every weekday. Image credit: Krisztian Bocsi/Bloomberg/Getty