ToplineU.S. stock futures surged in premarket trading early on Thursday, led by a big bump in Nvidia’s stock, as the chipmaker’s earnings blew past analysts' forecasts and curbed fears of an artificial intelligence-led bubble that had weighed on the market in the past few weeks.Nvidia President and CEO Jensen Huang delivers the keynote address during the Nvidia GTC (GPU Technology Conference).Getty ImagesKey FactsBuoyed by its blowout earnings report, Nvidia’s shares rose to $195.20 in premarket trading ear ...