We have to explain this matter, but we really have problems to consider our immediate take-off, it long enough to string together a number of fully serve their sentences. Festo illustrates the AirJelly by some magical properties of the jelly fish, a lithium-ion batteries, an electric motor and a helium. If this is not floaty enough, you also have water version, aquajelly. Videos are, for a rest.
Unbelievable, Festo AirJelly flies through the air with the greatest of ease (video)