The AI chip leader is now the world's largest publicly traded company.Given the performance of Nvidia (NVDA 1.09%) stock over the past few years, one could forgive casual observers for assuming it is in a bubble. The stock is up by around 1,500% from the cyclical bottom it sank to three years ago, and some of its valuation metrics may leave investors wondering if it is more than just "overvalued."Still, investors also have to remember that its semiconductors are the foundation that the artificial intelligen ...