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China and the US ended the second day of high-stakes trade talks Friday with “big differences”, Beijing said, leaving the world’s two largest economies on the brink of a trade war that could have knock-on effects on the global economy. The talks were aimed at forestalling momentum towards the looming conflict, with both sides prepared to pull the trigger on tariffs that could affect trade in billions of dollars of goods. “Both sides recognise there are still big differences on some issues and that they need to continue to step…

NASA has said that it successfully demonstrated a new nuclear reactor power system that could enable crewed missions to the Moon, Mars and destinations beyond. NASA announced the results of the demonstration, called the Kilopower Reactor Using Stirling Technology (KRUSTY) experiment on Wednesday at its Glenn Research Center in Cleveland. The Kilopower experiment was conducted at the US Department of Energy’s National Nuclear Security Administration’s Nevada National Security Site from November 2017 through March. Such a demonstration could pave the way for future Kilopower systems that power human outposts on…