Big AI investments vs. uncertain returns

From the BBC World Service: Wall Street was cheered last night by better-than-expected results from the chip giant Nvidia. But the AI boom continues to fuel fears of a market bubble. In the past few weeks, a growing number of the world’s leading figures in finance have suggested that AI stocks are unrealistically inflated in value. Plus, Meta says it's shutting down accounts for younger teenagers in Australia ahead of the country's social media ban for youths under 16.