A story about showing people something impossible and watching them find a use for it. The rock was the size of a Volkswagen. Marcus had been building up to it all afternoon. He’d started small — a coffee cup hovering three inches above the kitchen table, rotating slowly, steam still curling from the surface. His father had watched from behind the Sunday paper and said, "Nice trick. Magnets?" "Dad. There are no magnets." "String, then. You kids and your TikTok videos." Marcus let the cup drift higher. Four feet. Six feet. It touched the ceiling, left a small ring of condensation on the plaster, and floated back down to the table without spilling a drop. His father turned a page. "Your mother used to do something similar with a hair dryer and a ping pong ball. Physics thing." So Marcus moved to the backyard. He levitated the patio chair — the heavy wrought-iron one that took two people to move during parties.…