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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.Meta's Instagram said that its service has returned to normal after the interruption. According to Downdetector.com, a network status tracking website, after thousands of users encountered technical problems when accessing the Instagram platform on Wednesday, Instagram said that its service was back online. During the peak period of failure, which started around 12:50 pm EST, Facebook reported more than 100,000 failures and Instagram reported nearly 70,000 failures. As of 6: 00 pm EST, the number of reports from these two applications has dropped to more than 1,000. Downdetector data is based on reports submitted by users. The actual number of users affected may vary.The policy continued to catalyze the large consumption sector or welcome a new round of valuation to repair the market. On December 11, the A-share market shrank. The concept sector of big consumption has been concerned by the market, and the food, beverage and retail sectors are among the top gainers. Analysts believe that near the Spring Festival, the top-down emphasis on domestic demand and policy expectations are heating up, and the big consumer sector is expected to usher in a new round of valuation repair. An Yaze, chief analyst of the food and beverage industry of CITIC Jiantou Securities, said that the recent introduction of a series of incremental fiscal and monetary policies has released a clear policy signal to strive to achieve the goals and tasks of economic and social development throughout the year, focusing on boosting consumption and expanding effective domestic demand. The food and beverage industry is expected to usher in a turning point in the boom. (china securities journal)

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.The performance of deep thinking AI model exceeds the existing weather forecast. A study published in the new issue of Nature reported the latest machine learning model introduced by deep thinking. The model can make reliable probabilistic weather forecast according to current and future weather, and its performance not only exceeds the best traditional medium-range weather forecast, but also can better predict extreme weather, tropical cyclone route and wind energy production.The rate of return of the money fund has reached a record low. Since December, the rate of return of the money fund has continued to decline. The annualized rate of return of Tianhong Yubao Money Fund, the largest, fell below 1.27% on the 7th, hitting a record low. According to industry insiders, the recently released "Self-discipline Initiative on Optimizing the Self-discipline Management of Non-bank Interbank Deposit Interest Rate" has a great impact on the Monetary Fund, and the superimposed interest rate is at a low level, and the yield of the Monetary Fund may continue to decline. As the income decreases, funds will look for new directions for allocation. (SSE)

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.US$ 895 billion The US House of Representatives passed the national defense policy bill for fiscal year 2025. On December 11, local time, the US House of Representatives passed the national defense policy bill of US$ 895 billion with 281 votes in favor and 140 votes against, authorizing the Ministry of National Defense to provide funds for fiscal year 2025. It is reported that the bill has now been sent to the Senate.Medical staff: At least seven Palestinians were killed in Israeli air strikes. They were responsible for protecting aid trucks in the south of the Gaza Strip.