Thirty genuinely true, cross-checked facts about the machines you use every day and almost never think about — spanning Flight, Ships & the Sea, Trains & Roads, Lifts & Buildings, Bridges & Structures, Materials, Space Machines and Everyday Engineering. Inside: why train wheels are cones — and why that, not the flange, is what keeps the train on the rails, why many lift ‘close door’ buttons are disconnected placebos, and why airports occasionally have to repaint their runway numbers because the magnetic pole has moved. No myths, no filler — every fact verified against independent sources.