Blimps are obsolete nowadays. Blimps were always a danger to air travel, as well as its passengers. An example of the dangers of blimps was the Hindenburg tragedy.
Today's blimps are not filled with flammable hydrogen gas like Hindenburg was, but normally the non-flammable helium.
Blimps began to be used commonly during World War I, and are still in use today.
Yes, helium has been used in blimps as a lifting gas. Helium is less dense than air, which allows it to provide buoyancy and help the blimps stay afloat. However, today, most blimps use a combination of helium for lift and air for control and propulsion.
Are now known as blimps, they are more used for advertising purposes.
Some have to learn it at school, others have to learn it to communicate in Greece, or with Greek visitors.
To my knowledge helium is the only practical lift element for blimps. Hydrogen actually works better than helium, and it is cheaper, but it is highly combustible and not used anymore.
The Greek and Roman alphabets were derived from it, and it forms the basis of our alphabetic writing today, with which we communicate and record.
Size and type of gas contained in the envelope.
they pray to communicate with God
It's helps us by making travel easier and faster.
They communicate by two-way VHF radio.
The telephone has the same purpose today as it always has had - to communicate.