Porthole paradox: Why, and since when, have the windows of a ship鈥檚 hull been round?
Cubed route: The pattern of bubbles in ice cubes has always fascinated me. Why is the highest concentration in the centre, with spines of progressively smaller bubbles radiating outwards?
Electric express: Many electric underground metro trains can accelerate rapidly from a standing start at a platform. Why are most electric trains running above ground apparently unable to achieve the same rapid acceleration.
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Hot Wiring: Why, after ironing, is the live pin of my 13-amp plug hot while the neutral pin is not? Surely the same amount of current flows through both.