AI bubble fears return as Wall Street falls back from short-lived rally

Leading US stock markets tumble less than 24 hours after strong results from chipmaker Nvidia sparked gainsFears of a growing bubble around the artificial intelligence frenzy resurfaced on Thursday as leading US stock markets fell, less than 24 hours after strong results from chipmaker Nvidia sparked a rally.Wall Street initially rose after Nvidia, the world’s largest public company, reassured investors of strong demand for its advanced data center chips. But the relief dissipated, and tec