This is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox. Happy Friday. If you were following the meme stock-ification of Wendy's , the fast-food chain's surge didn't extend to a second day. Stock futures are lower this morning. The S&P 500 ended yesterday near flat. Here are five key things investors need to know to start the trading day: Even Micron' s big post-earnings rally couldn't turn the Nasdaq Composite around yesterday. The tech-heavy index