Tech buff Steve Caplin finds an answer to Simon Rose's earlier question about who invented the wheeled suitcase. There's a pilot-it-yourselves VTOL sightseeing plane, a hydrogen-powered commuter bike and supercar, an electronic nose to detect prostate cancer, a toilet sensor to identify cholera outbreaks, a gel to kill harmful bacteria, nuclear-reactor robots to repair the 3,000 malfunctioning satellites, Elon Musk's brain chip and Apple allowing people in the UK to repair their own phones. Steve says, "Don't even think about it."
