If you can’t laugh at least a little on days like last Thursday, I can say this: It’s healthier than getting frustrated. I’m a risk manager, and that makes wild downward reversal days exciting for me. It also means I occasionally leave money on the table in up markets. So for me, Thursday’s laugh was when trading interrupted an article I started writing shortly after the market opened. The title: More News from Barchart Nvidia’s big day rallies QQQ, but for how long? What the charts are telling me to do. ...