The Chinese chariot that always points south, the first person killed by a robot, the invisible code produced by all modern printers and photocopiers, and the helicopter which flew 12 kilometres up… and then stopped.
In 1972 a helicopter set a new altitude record: 12,442 metres. At the peak of that flight, the engine stopped and would not restart.
Modern colour printers and photocopiers add a secret near-invisible code to identify the documents they produce.
In 1979, Robert Williams became the first person in history to be killed by a robot.
The south-pointing chariot always points south, and it does so without the aid of magnets.
For more facts about surprising modes of transportation, ingenious mechanisms, and modern and ancient technology, begin here: