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Scientists observed semi-Dirac fermion for the first time, and scientists from Pennsylvania State University and Columbia University joined hands to observe a special kind of quasi-particle-semi-Dirac fermion for the first time. Such quasi-particles have mass when moving in one direction, but lose mass when moving in the other direction. The researchers said that in-depth research on these quasi-particles is expected to promote the development of next-generation batteries, sensors and other technologies. Related papers were published in the new issue of Physical Review X.According to OpenAI, ChatGPT is now integrated into Apple's iOS, iPadOS and macOS, and users will be able to access ChatGPT through these systems.In response to Trump's tariff threat, the Canadian Prime Minister held another meeting with provincial governors. On December 11, local time, Canadian Prime Minister Trudeau held another meeting with provincial governors to discuss the tariff threat of US President-elect Trump. This is the second time that Trudeau has held a meeting with provincial governors since Trump threatened to impose a high tariff of 25% on Canada last month. It is also the first time that Trudeau has met with governors after having dinner with Trump at Haihu Manor. Trudeau said that if Trump really continues to impose a 25% tariff on all Canadian goods shipped to the United States, Canada is prepared to make some kind of response. The outside world believes that this statement means that Canada will impose retaliatory tariffs on some American goods. (CCTV News)

Goldman Sachs upgraded Societe Generale to neutral. Chris Hallam, an analyst at Goldman Sachs, had a previous rating of sell. The target price is 29.25 euros, which is 9% higher.Market participants: In 2025, the steel industry may deduce the upstream profit-making logic. At the 2025 China steel market prospect and the annual meeting of "My Steel", whether the profit space of steel enterprises can be enlarged in 2025, whether the supply-side capacity will be withdrawn in an orderly manner, and what factors should be relied on for the long-term development of enterprises have become the minds of many participants. The industry believes that the survival pressure of steel enterprises may be eased in 2025. The upstream supply of iron ore, coke and coking coal will reduce their prices, and the cost of steel enterprises will fall. The market may deduce the upstream profit-making logic. Market participants said that although steel prices are still expected to decline in 2025, the profit margin of steel enterprises may increase. (SSE)Economic Daily: "Stabilizing the stock market" strongly guides stabilizing expectations. The article said that the key to stabilizing the stock market is to stabilize confidence. Recently, the stock market has been active in trading, and investors' confidence in the economic improvement and corporate profits has improved. All parties look forward to leveraging the stock market as the entry point to further stabilize the economy and steady growth. This expectation can only form a continuous positive feedback if it is mutually reinforced with the positive signals on the economic side. In the future, it is necessary to continue to improve the forward-looking, targeted and effective macro-control, urge all localities and departments to implement the defined policies and measures as soon as possible, solidly promote the economic upward, structural improvement and sustained development, and promote confidence boost and a virtuous circle and spiral rise in economic fundamentals.

The onshore RMB closed at 7.2615 yuan against the US dollar at night, down 124 points from Tuesday's night closing. The turnover was $57.609 billion.According to South Korean media reports on the 12th, South Korea's National Archives Institute and the President's Archives began to check the emergency martial law related files.Brazil raised the benchmark lending rate by 100 basis points to 12.25%. Brazil's central bank expects the next two meetings to raise interest rates by the same amount.