Meet Jessica, 27, a freelance yoga instructor from Scottsdale who picked up substitute teaching to cover rent between studio gigs. On her first day covering AP Chemistry, the class had a 94% attendance rate. (The usual rate? 61%. We checked.) Within ten minutes of her writing the first equation on the board, three boys in the back spontaneously moved to the front row. Voluntarily. Let's be honest — nobody in that class learned a single thing about covalent bonds, but they all showed up for every remaining class she covered. The school got three anonymous donations for new classroom supplies that semester. All Venmo. All from 17-year-olds.