Lumen Technologies stock may be hot, but it's still nowhere near the highs it reached in 2022. Nvidia's (NVDA -6.39%) stock has generated life-changing returns for many investors, thanks largely to its connection to artificial intelligence (AI) and the expanded interest in that sector of the economy. If you invested $33,000 into the stock five years ago and held onto it, you would be holding a $1 million investment right now. That's a staggering return in a relatively short time frame, especially when you c ...