Google is on pace for its worst day on the stock market in a year, as artificial intelligence concerns have mounted and two high-profile researchers departed for rivals in recent days. Shares of parent company Alphabet slid 7% Monday morning, underperforming both the Nasdaq and the rest of its megacap peers. Google's brain drain concerns began last week when Google's vice president of engineering and a co-lead of its Gemini AI models Noam Shazeer announced Wednesday that he was leaving the