Investing.com– The S&P 500 closed higher Tuesday, as an Nvidia-led climb in tech helped stocks shrug off earlier concerns about increasing Russia-Ukraine tensions. At 4.00 p.m. ET (2100 GMT), the fell 120 points, or 0.3%, the index gained 0.4%, and the added 1%. Nvidia leads tech higher ahead of earnings NVIDIA (NASDAQ:), the world’s most valuable listed company, gained more than 4% just a day ahead of its quarterly earnings report. Nvidia