In 1912, an Austrian tailor jumped to his death from the first-level platform of the Eiffel Tower. The jump had been an attempt to prove the value of his invention – a wearable parachute – then much in demand for the early days of aviation. The Paris police had given permission for the test but on the understanding that a dummy would be thrown over, not a live human. For a parable of designing your tests in a responsible and appropriate manner, read on...