MIT professor accidentally leaked his NotebookLM grading system during a Zoom call. Dude forgot to turn off screen share and we watched him grade 47 essays in 12 minutes. Here's what he was doing that blew my mind. He uploaded all student papers plus his original rubric into NotebookLM. Then asked it to "evaluate each paper against these specific criteria and flag any that deviate from expected patterns." But the crazy part was his follow-up prompt. "Now cross-reference writing styles with previous submissions and highlight potential academic integrity concerns." The AI caught three cases of weird style shifts he would've missed on his own. Final step killed me. He asked NotebookLM to "generate personalized feedback that connects each student's weak points to specific course materials they should review." What took him 6 hours before now happens in 15 minutes. And students get better feedback than his handwritten comments ever provided. The man turned grading from torture into actual teaching.