the daily brief

• Trump hosted Xi Jinping at the White House for their second 2026 summit, with AI, rare earths, US auto-market access and extending the Busan trade truce on the agenda, though few concrete results were expected — nbc news
• Iranian airlines were forced to cancel some international flights — to Baghdad, Muscat, Qatar, Georgia and Azerbaijan — as new US sanctions took effect Wednesday, though routes to China such as a Mahan Air flight to Guangzhou continued operating — al jazeera
• Ukraine unveiled an unconditional ceasefire proposal backed by a joint statement from 50 countries, while Zelensky asked Trump to press Xi Jinping to lean on Putin to help end the war — mezha
• A Russian missile attack on Kyiv killed a 65-year-old man and injured two others, damaging a maternity hospital and nearby homes, hours after Moscow rejected calls to pause the war during UN negotiations — kyiv post
• 51 countries backed a joint statement calling for a Black Sea initiative to safeguard grain-export shipping, with the EU's Kaja Kallas accusing Russia of trying to choke off Ukrainian food exports — kyiv post
• Erdoğan met Zelensky at the Turkevi in New York on the UN General Assembly sidelines, pledging Türkiye's continued support for a lasting Russia-Ukraine peace — anews
• A late-September Houthi drone strike killed four Bahraini members of the Saudi-led coalition, overshadowing the first official Houthi visit to Riyadh since the war began — al jazeera
• Houthi forces completed their seizure of Yemen's entire Red Sea coast by recapturing the Hanish Islands, having earlier retaken Perim Island near the Bab el-Mandeb strait — globalsecurity.org

• The UN Security Council, under France's September presidency, convened its first-ever session directly hosting frontier US and Chinese AI developers together, with OpenAI's Sam Altman and senior Anthropic representatives joining China's DeepSeek and Moonshot to discuss AI and international security — aiweekly
• Anthropic said Claude discovered a novel enzyme system with properties reminiscent of CRISPR, identifying it with only high-level direction from the company's scientists — anthropic
• Google DeepMind's new head, Koray Kavukcuoglu, said Gemini 4 has entered early-stage post-training, the phase where a base model is refined for reliable performance — investing.com
• OpenAI is discontinuing its Sora API on September 24, ending developer access to the video-generation tool — aiweekly
• Alphabet's Intrinsic released Intrinsic Core, an open-source, ROS-compatible robotics environment bundling real-time control, Nvidia FoundationPose-based pose estimation, and motion and grasp planning, at ROSCon 2026 in Toronto — aiweekly

• Stocks fell Wednesday as the 10-year Treasury yield spiked above 5.11%, its highest since 2007, while Brent crude climbed near $103 a barrel — the Dow dropped 0.7%, the S&P 500 fell 0.8% and the Nasdaq lost 1.1% — yahoo finance
• Rising oil prices and yields fueled bets the Federal Reserve will keep raising rates, even as a closely watched gauge of US business activity expanded more than economists had forecast — schwab
• Energy stocks outperformed the broader selloff as crude prices climbed, with the sector's benchmark ETF gaining while most of the market fell — benzinga

• Physicists recorded the first real-time "quantum jumps" of sound, watching single phonons abruptly vanish from one energy state into another — a breakthrough that could open new paths for quantum computing and error correction — sciencedaily
• Some tropical trees evolved to take in carbon dioxide at night, keeping their pores closed during the hot daytime to conserve water and survive drought — sciencedaily
• Scientists are studying diatoms, sea sponges and plants for cleaner ways to recover rare-earth elements and other valuable minerals hidden in coal ash, red mud and mine tailings — sciencedaily
• Neutron and X-ray imaging of a broken rib from Scotty, the largest known T. rex, revealed a 66-million-year-old network of fossilized blood vessels formed as the injury was still healing when the animal died — sciencedaily

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