creating a flame made up of clouds of mist lit by LED rays that organisers described as environmentally-friendly fire. The helium balloon would then take the cauldron 30 metres (98 feet ...

But you can still fly your own with a helium balloon and some electronics. One notable project — the Blimpduino — has evolved into the Blimpduino 2. The open-source software is on GitHub.

Chef Grant Achatz serves up some very unusual dishes, and one of the most popular is an edible helium balloon. Customers are served the balloons and encouraged to suck in the helium before eating it.