Earlier this week in Sydney a drone display using colourful lights had to be abandoned as 90 drones suddenly fell out of the sky and plunged into Darling Harbour. The organisers put it down to a "technical hitch", a handy expression when everything goes wrong. With drones infiltrating the news so much these days it is almost reassuring that they can also be fragile just like humans.
Drones have long been used for spectacular light shows, but they don't always behave themselves. There was a similar incident in Melbourne a couple of years ago. Spectators witnessed 350 drones plunge like lemmings into the Yarra River. But at least these shows were for entertainment purposes.
