Nvidia posted another blowout quarter in November. Its stock still fell. Why?November was a tough month for Nvidia (NVDA 0.80%) investors. Despite reporting another blowout quarter on November 19th, the artificial intelligence (AI) juggernaut's stock fell 12.6% from the closing bell on Oct. 31 through the end of trading on Nov. 28. November was marked by growing fear of an AI bubble with Nvidia at its very heart. While Nvidia itself is making incredible amounts of money selling picks and shovels to AI gold ...