NVIDIA has recently become the world's most valuable company as its chips — critical for AI software — give it exponential growth. But there's talk of an AI bubble along with some worrying signs: | DW News

Shares in Nvidia initially popped as much as 5% Thursday after the U.S. firm beat expectations in third-quarter results, but later reversed that surge and turned negative. CNBC's Kristina Partsinevelos explains what you need to know. Find more: cnb.cx/44h05pR | CNBC