Key TakeawaysThe U.S. government has initiated a shutdown after Congress failed to pass a funding bill by the deadline, marking the first such lapse in nearly seven years and potentially furloughing hundreds of thousands of federal workers.Apple (AAPL) has defended its partnership with OpenAI for generative AI integration, while Nvidia's (NVDA) substantial $100 billion investment in OpenAI has raised dot-com bubble concerns among some analysts.YouTube TV (GOOGL) and NBCUniversal have reached a temporary ext ...