DeepSeek continues to rattle markets

From the BBC World Service: A lower-cost artificial intelligence chatbot from a Chinese start-up is fueling a second day of global tech stock sell-offs as investors flag concerns about AI advancements in China. U.S. President Donald Trump calls it a “wake-up call” for U.S. firms. And later: Is Elon Musk’s role in the Trump administration impacting brand decisions about advertising on X? We’ll hear more.