Welcome to Yahoo Finance's flagship show, The Morning Brief. I'm Ally Canel. Let's get to the three things you need to know today.First up, tech stocks are powering futures higher this morning. The rally in stock spurred by AI giant Open AI, which just became the world's most valuable company. According to new reports, OpenAI's valuation is now $500 billion after current and former employees sold about$6.6% 6 billion worth of stock, boosting the company's price tag well above its previous $300 billion leve ...