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Researchers studying the Xingu Indigenous Park in Brazil report that pre-Columbian Amazonians deliberately created terra preta — extremely fertile, carbon-rich 'dark earth' — and that modern Kuikuro farmers are still making it today. New estimates put the carbon stored in just one slice of dark-earth soil at more than nine million tonnes, a discovery that experts say could rival the carbon cycle itself in significance for climate science.

Researchers in Vienna and Duisburg have placed metallic nanoparticles containing thousands of sodium atoms into a quantum superposition — effectively in two places at once — and confirmed the result with a fourth-order quantum signature. The objects, with masses exceeding 170,000 atomic mass units, push the macroscopic quantum frontier roughly an order of magnitude beyond every previous experiment and offer one of the strongest tests yet of quantum mechanics on scales approaching the everyday world.